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A storage case includes a frame, a top plate, and a drawer. The frame includes a bottom plate, side plates, and a rear plate. The top plate covers the upper side of the frame. The drawer is freely pulled out of and pushed into the frame through an open front side of the frame. The side plates of the

A storage case includes a frame, a top plate, and a drawer. The frame includes a bottom plate, side plates, and a rear plate. The top plate covers the upper side of the frame. The drawer is freely pulled out of and pushed into the frame through an open front side of the frame. The side plates of the frame are foldable between an upright position, at which the side plates extend upright from left and right sides of the bottom plate, and a folded position, at which the plates extend along an upper surface of the bottom plate. The rear plate is foldable between an upright position, at which the rear plate extends upright from a rear side of the bottom plate, and a folded position, at which the rear plate extends along a lower surface of the bottom plate.

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1. A storage case comprising: a frame including a bottom plate, left and right side plates, a rear plate, an open front side, and an open upper side, wherein the frame is formed from a synthetic resin;a top plate that covers the upper side of the frame body, wherein the top plate is formed from a sy

1. A storage case comprising: a frame including a bottom plate, left and right side plates, a rear plate, an open front side, and an open upper side, wherein the frame is formed from a synthetic resin;a top plate that covers the upper side of the frame body, wherein the top plate is formed from a synthetic resin;a main body including the frame and the top plate; anda drawer that is freely pulled out of and pushed into the main body through the open front side of the frame in the main body, wherein the drawer is formed from a synthetic resin and includes an open upper side, whereingrooves are formed in an upper surface of the top plate and extend in a direction orthogonal to a moving direction of the drawer; left and right sides of the top plate each comprises a top plate attachment portion; the top plate attachment portion on one side is a projection-retraction attachment portion that allows a coupling member to move in a sideward direction; the top plate attachment portion on another side is a fitting hole portion that detachably receives another coupling member of another adjacently disposed storage case;the left and right side plates are foldable between an upright position, at which the left and right side plates extend upright from left and right sides of the bottom plate of the frame, and a folded position, at which the left and right side plates extend along an upper surface of the bottom plate, via a side plate folding mechanism on each side; wherein the side plate folding mechanism on each side comprises three fitting projections on a lower side of a corresponding side plate, pins extending from opposite sides of each fitting projection, three fitting recesses formed in a corresponding side of the bottom plate and fitted with the fitting projections, a restriction surface formed in each fitting recess to restrict further movement of the corresponding fitting projection from the upright position, and bearing holes that receive the pins; andthe rear plate is foldable between an upright position, at which the rear plate extends upright from a rear side of the bottom plate of the frame, and a folded position, at which the rear plate extends along a lower surface of the bottom plate. 2. A storage case comprising: a plurality of frames that can be stacked one upon the other, each frame including a bottom plate, left and right side plates, a rear plate, an open front side, and an open upper side, wherein the frames are formed from a synthetic resin;a top plate that covers the upper side of an uppermost one of the stacked frames, wherein the top plate is formed from a synthetic resin;a main body including the frames and the top plate; anda plurality of drawers that are freely pulled out of and pushed into the main body through the open front sides of the frames in the main body, wherein the drawers are formed from a synthetic resin and each of the drawers includes an open upper side, whereingrooves are formed in an upper surface of the top plate and extend in a direction orthogonal to a moving direction of the drawers; left and right sides of the top plate each comprises a top plate attachment portion; the top plate attachment portion on one side is a projection-retraction attachment portion that allows a coupling member to move in a sideward direction; the top plate attachment portion on another side is a fitting hole portion that detachably receives another coupling member of another adjacently disposed storage case;the left and right side plates of each frame are foldable between an upright position, at which the left and right side plates extend upright from left and right sides of the corresponding bottom plate, and a folded position, at which the left and right side plates extend along an upper surface of the corresponding bottom plate, via a side plate folding mechanism on each side; wherein the side plate folding mechanism on each side comprises three fitting projections on a lower side of a corresponding side plate, pins extending from opposite sides of each fitting projection, three fitting recesses formed in a corresponding side of the bottom plate and fitted with the fitting projections, a restriction surface formed in each fitting recess to restrict further movement of the corresponding fitting projection from the upright position, and bearing holes that receive the pins; andthe rear plate of each frame is foldable between an upright position, at which the rear plate extends upright from a rear side of the corresponding bottom plate, and a folded position, at which the rear plate extends along a lower surface of the corresponding bottom plate.