A chair-convertible walking stick comprising: a stick shank extending in a lengthwise direction to terminate at a grip end and a foot end; a collar sleeve sleeved on said stick shank and movable between distal and proximate positions relative to said grip end; a carrier mounted on said stick shank; a seat unit including, a middle portion extending in a longitudinal direction to terminate at a forward edge and a rearward edge which is pivotally connected to said collar sleeve, and left and right wing portions each being juxtaposed with said middle portion along a hinge line, and each being hinged to said middle portion at the respective hinge line such that when said collar sleeve is displaced from the distal position to the proximate position, said seat unit is convertible from a use state, where said middle portion is coplanar with said left and right wing portions, to a collapsed state, where said middle portion is at an included angle with each of said left and right wing portions; two keyways each being disposed on an under surface of a corresponding one of said left and right wing portions, and each extending along the longitudinal direction to terminate at front and rear keyway ends(331,332); two bracing bars each having a pivot end pivotally connected to said carrier, and a key end configured to be slidably engaged with a corresponding one of said keyways such that when said key end slides from said front keyway end of a respective one of said keyways to said rear keyway end of the respective one of said keyways, said seat unit is converted from the use state to the collapsed state; and two prop legs each extending to terminate at a bottom end for standing on the ground, and a pivoted end pivotally connected to said carrier, said two prop legs being convertible between a straddling position, where said bottom ends of said prop legs are remote from said stick shank, and an upheld position, where said bottom ends are close to said stick shank such that when said collar sleeve is displaced from the distal position to the proximate position, said prop legs are permitted to move from the straddling position to the upheld position, wherein the chair-convertible walking stick is characterized in that said front keyway end is disposed remote from the respective hinged line, and said rear keyway end is disposed close to the respective hinged line so as to facilitate conversion of said seat unit from the use state to the collapsed state. a stick shank extending in a lengthwise direction to terminate at a grip end and a foot end; a collar sleeve sleeved on said stick shank and movable between distal and proximate positions relative to said grip end; a carrier mounted on said stick shank; a seat unit including, a middle portion extending in a longitudinal direction to terminate at a forward edge and a rearward edge which is pivotally connected to said collar sleeve, and left and right wing portions each being juxtaposed with said middle portion along a hinge line, and each being hinged to said middle portion at the respective hinge line such that when said collar sleeve is displaced from the distal position to the proximate position, said seat unit is convertible from a use state, where said middle portion is coplanar with said left and right wing portions, to a collapsed state, where said middle portion is at an included angle with each of said left and right wing portions; two keyways each being disposed on an under surface of a corresponding one of said left and right wing portions, and each extending along the longitudinal direction to terminate at front and rear keyway ends(331,332); two bracing bars each having a pivot end pivotally connected to said carrier, and a key end configured to be slidably engaged with a corresponding one of said keyways such that when said key end slides from said front keyway end of a respective one of said keyways to said rear keyway end of the respective one of said keyways, said seat unit is converted from the use state to the collapsed state; and two prop legs each extending to terminate at a bottom end for standing on the ground, and a pivoted end pivotally connected to said carrier, said two prop legs being convertible between a straddling position, where said bottom ends of said prop legs are remote from said stick shank, and an upheld position, where said bottom ends are close to said stick shank such that when said collar sleeve is displaced from the distal position to the proximate position, said prop legs are permitted to move from the straddling position to the upheld position, wherein the chair-convertible walking stick is characterized in that said front keyway end is disposed remote from the respective hinged line, and said rear keyway end is disposed close to the respective hinged line so as to facilitate conversion of said seat unit from the use state to the collapsed state.