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A swivel stool includes a foldable leg arrangement having a plurality of leg frames pivotally connected to each other to form a receiving cavity defined within the leg frames, a seat unit including a seat frame and a back frame pivotally connected to the seat frame. The swivel stool is arranged to o

A swivel stool includes a foldable leg arrangement having a plurality of leg frames pivotally connected to each other to form a receiving cavity defined within the leg frames, a seat unit including a seat frame and a back frame pivotally connected to the seat frame. The swivel stool is arranged to operate between a folded position and an unfolded position, wherein in the folded position, the back frame is overlappedly folded toward the seat frame, while the seat unit is pivotally and downwardly folded with respect to the leg frames to receive into the receiving cavity of the foldable leg arrangement, wherein in the unfolded position, the seat unit is pivotally and upwardly unfolded with respect to the leg frames while the back frame is pivotally unfolded with respect to the seat frame for allowing a user to sit on the seat unit.

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1. A swivel stool, comprising: a foldable leg arrangement, which comprises a plurality of leg frames pivotally connected to each other to form a receiving cavity defined within said leg frames; anda seat unit, which comprises:a seat frame attached on said foldable lea arrangement in a foldably movab

1. A swivel stool, comprising: a foldable leg arrangement, which comprises a plurality of leg frames pivotally connected to each other to form a receiving cavity defined within said leg frames; anda seat unit, which comprises:a seat frame attached on said foldable lea arrangement in a foldably movable manner; anda back frame pivotally extended from said seat frame, wherein said swivel stool is arranged to operate between a folded position and an unfolded position, wherein in said folded position, said back frame is overlappedly folded toward said seat frame, while said seat unit is pivotally and downwardly folded with respect to said leg frames to receive into said receiving cavity of said foldable leg arrangement so as to reduce said swivel stool into a compact size, wherein in said unfolded position, said seat unit is pivotally and upwardly unfolded with respect to said leg frames while said back frame is pivotally unfolded with respect to said seat frame for allowing a user to sit on said seat unit, wherein said receiving cavity is cleared for receiving an object therein, wherein said back frame is pivotally connected to said seat frame for folding between said folded position and said unfolded position, wherein each of said leg frames has two longitudinal portions, an upper transverse portion extended from between two upper ends of said longitudinal portions, and a lower transverse portion extended between two lower ends of said longitudinal portions to form a substantially rectangular cross section of said corresponding leg frame, wherein said seat unit is mounted above said upper transverse portions of said leg frames, wherein each of said upper transverse portions of said leg frames has a supporting platform for suspendedly hanging or supporting said object in said receiving cavity, wherein said seat frame of said seat unit comprises a frame member rotatably mounted on said supporting platform, and a retention member provided at a front end portion of said frame member, wherein when said swivel stool is operated at said unfolded position, one of said upper transverse portions of said corresponding leg frame is arranged to engage with said retention member so as to restrain a further pivotal movement of said corresponding leg frame while said leg frames are arranged to securely support said seat unit and said person sitting thereon. 2. The swivel stool, as recited in claim 1, wherein said retention member comprises a retention hook formed at said front end portion of said frame member and is to downwardly extended therefrom for selectively engaging with said corresponding upper transverse portion of said leg frame. 3. The swivel stool, as recited in claim 2, wherein said seat frame further comprises a seat cushion mounted on said frame member so that said seat cushion is capable of freely rotating above said leg frames. 4. The swivel stool, as recited in claim 3, wherein said back frame comprises a back support frame and a back cushion mounted on said back support frame for providing a cushion effect to said user sitting on said swivel stool. 5. The swivel stool, as recited in claim 4, wherein said back support frame comprises a plurality of frame extension units spacedly mounted at two side edge portions of said frame member, wherein each of said frame extension units comprises a base unit mounted on said corresponding side edge portion of said frame member, and an adjustable unit upwardly and pivotally extended from and adjustably coupled to said base unit, wherein said back cushion is mounted between said adjustable units for providing said cushion effect to said user. 6. The swivel stool, as recited in claim 5, wherein each of said base units is connected to said corresponding side edge portion of said frame member in such a manner that said adjustable unit is capable of pivotally and rearward folding into said receiving cavity of said foldable leg arrangement. 7. The swivel stool, as recited in claim 6, wherein said seat cushion is mounted to said base units so that said seat cushion is capable of pivotally and overlappedly folding toward said back frame via said adjustable unit, such that said seat cushion which is overlappedly folded on said back frame and is capable of following said adjustable unit to pivotally folded into said receiving cavity when said swivel stool is at said folded position. 8. The swivel stool, as recited in claim 7, wherein said swivel stool further comprises a support arrangement mounted on said foldable leg arrangement and is arranged to support said object in said receiving cavity when said swivel stool is at said unfolded position. 9. The swivel stool, as recited in claim 8, wherein said support arrangement comprises a holding strap mounted on said upper transverse portions of said leg frames for supporting said object on said holding strap which is arranged to suspenedly support said object in said receiving cavity when said swivel stool is at said unfolded position. 10. The swivel stool, as recited in claim 6, wherein said swivel stool further comprises a support arrangement mounted on said foldable leg arrangement and is arranged to support said object in said receiving cavity when said swivel stool is at said unfolded position. 11. The swivel stool, as recited in claim 10, wherein said support arrangement comprises a holding strap mounted on said upper transverse portions of said leg frames for supporting said object on said holding strap which is arranged to suspenedly support said object in said receiving cavity when said swivel stool is at said unfolded position. 12. The swivel stool, as recited in claim 2, wherein said swivel stool further comprises a support arrangement mounted on said foldable leg arrangement and is arranged to support said object in said receiving cavity when said swivel stool is at said unfolded position. 13. The swivel stool, as recited in claim 12, wherein said support arrangement comprises a holding strap mounted on said upper transverse portions of said leg frames for supporting said object on said holding strap which is arranged to suspenedly support said object in said receiving cavity when said swivel stool is at said unfolded position. 14. The swivel stool, as recited in claim 1, wherein said seat frame further comprises a seat cushion mounted on said frame member so that said seat cushion is capable of freely rotating above said leg frames. 15. The swivel stool, as recited in claim 14, wherein said back frame comprises a back support frame and a back cushion mounted on said back support frame for providing a cushion effect to said user sitting on said swivel stool. 16. The swivel stool, as recited in claim 15, wherein said back support frame comprises a plurality of frame extension units spacedly mounted at two side edge portions of said frame member, wherein each of said frame extension units comprises a base unit mounted on said corresponding side edge portion of said frame member, and an adjustable unit upwardly and pivotally extended from and adjustably coupled to said base unit, wherein said back cushion is mounted between said adjustable units for providing said cushion effect to said user. 17. The swivel stool, as recited in claim 16, wherein each of said base units is connected to said corresponding side edge portion of said frame member in such a manner that said adjustable unit is capable of pivotally and rearward folding into said receiving cavity of said foldable leg arrangement. 18. The swivel stool, as recited in claim 17, wherein said seat cushion is mounted to said base units so that said seat cushion is capable of pivotally and overlappedly folding toward said back frame via said adjustable unit, such that said seat cushion which is overlappedly folded on said back frame and is capable of following said adjustable unit to pivotally folded into said receiving cavity when said swivel stool is at said folded position. 19. A swivel stool, comprising: a foldable leg arrangement, which comprises a plurality of leg frames pivotally connected to each other to form a receiving cavity defined within said leg frames; anda seat unit, which comprises:a seat frame attached on said foldable leg arrangement in a foldably movable manner; anda back frame pivotally extended from said seat frame, wherein said swivel stool is arranged to operate between a folded position and an unfolded position, wherein in said folded position, said back frame is overlappedly folded toward said seat frame, while said seat unit is pivotally and downwardly folded with respect to said leg frames to receive into said receiving cavity of said foldable leg arrangement so as to reduce said swivel stool into a compact size, wherein in said unfolded position, said seat unit is pivotally and upwardly unfolded with respect to said leg frames while said back frame is pivotally unfolded with respect to said seat frame for allowing a user to sit on said seat unit, wherein said receiving cavity is cleared for receiving an object therein, wherein said back frame is pivotally connected to one of said corresponding leg frames for folding between said folded position and said unfolded position, wherein each of said leg frames has two longitudinal portions, an upper transverse portion extended from between two upper ends of said longitudinal portions, and a lower transverse portion extended between two lower ends of said longitudinal portions to form a substantially rectangular cross section of said corresponding leg frame, wherein said seat unit is mounted above said upper transverse portions of said leg frames, wherein each of said upper transverse portions of said leg frames has a supporting platform for suspenedly hanging or supporting said object in said receiving cavity, wherein said seat frame of said seat unit comprises a frame member mounted on said supporting platform, and a retention member provided at a front end portion of said frame member, wherein when said swivel stool is operated at said unfolded position, one of said upper transverse portions of said corresponding leg frame is arranged to engage with said retention member so as to restrain a further pivotal movement of said corresponding leg frame while said leg frames are arranged to securely support said seat unit and said person sitting thereon. 20. The swivel stool, as recited in claim 19, wherein said retention member comprises a retention hook formed at said front end portion of said frame member and is downwardly extended therefrom for selectively engaging with said corresponding upper transverse portion of said leg frame. 21. The swivel stool, as recited in claim 20, wherein said seat frame further comprises a seat cushion mounted on said frame member so that said seat cushion is capable of freely rotating above said leg frames. 22. The swivel stool, as recited in claim 21, wherein said back frame comprises a back support frame pivotally connected to said corresponding leg frame, and a back cushion mounted on said back support frame for providing a cushion effect to said user sitting on said swivel stool. 23. The swivel stool, as recited in claim 22, wherein said back support frame comprises a plurality of frame extension units spacedly mounted at two side edge portions of said leg frames respectively. 24. The swivel stool, as recited in claim 23, wherein said seat cushion is mounted to said base units so that said seat cushion is capable of pivotally and overlappedly folding toward said back frame via an adjustable unit, such that said seat cushion which is overlappedly folded on said back frame and is capable of following said adjustable unit to pivotally folded into said receiving cavity when said swivel stool is at said folded position. 25. The swivel stool, as recited in claim 24, wherein said swivel stool further comprises a support arrangement mounted on said foldable leg arrangement and is arranged to support said object in said receiving cavity when said swivel stool is at said unfolded position. 26. The swivel stool, as recited in claim 25, wherein said support arrangement comprises a holding strap mounted on said upper transverse portions of said leg frames for supporting said object on said holding strap which is arranged to suspenedly support said object in said receiving cavity when said swivel stool is at said unfolded position.