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A walking aid device includes a support body inclusive of a plurality of support elements extending toward the ground. Each support element is coupled to a caster and a brake unit. Each brake unit has a clutching surface. The clutching surface controllably clutches a wheel of the caster or the groun

A walking aid device includes a support body inclusive of a plurality of support elements extending toward the ground. Each support element is coupled to a caster and a brake unit. Each brake unit has a clutching surface. The clutching surface controllably clutches a wheel of the caster or the ground to thereby generate friction for stopping the walking aid device.

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1. A walking aid device, comprising: a support body comprising a plurality of support elements extending toward a ground and each having a first hollow-core portion;casters corresponding in quantity to the support elements, each said caster comprising a forked element and a wheel pivotally disposed

1. A walking aid device, comprising: a support body comprising a plurality of support elements extending toward a ground and each having a first hollow-core portion;casters corresponding in quantity to the support elements, each said caster comprising a forked element and a wheel pivotally disposed at the fbrked element, with the forked element extending to form a first guide column, wherein the first guide column of each caster is disposed at the first hollow-core portion of a corresponding one of the support elements, and each said first guide column has therein a second hollow-core portion; andbrake units corresponding in quantity to the support elements, each said brake unit comprising a second guide column disposed at the second hollow-core portion of a corresponding one of the first guide columns such that the second guide column is coupled to a corresponding one of the support elements, wherein a spring is disposed between each said first guide column and a corresponding one of the second guide columns, and each said second guide column is protruded from the second hollow-core portion to form two hoods each having a first clutching surface for controllably clutching the wheel of the caster. 2. The walking aid device of claim 1, wherein each said brake unit further comprises two lateral plates which flank not only the support element but also the caster and each have a second clutching surface and a slot, and each caster has a shaft slidably disposed in the slots of the two lateral plates, with each said slot having therein a spring elastically abutting against the shaft to allow the second clutching surfaces of the two lateral plates to controllably clutch the ground, thereby effectuating an instant stop.