To make the backward rotation of wheels temporarily lockable, and facilitate the climbing of an uphill road, simply by installing attachments on the exiting ordinary wheel chair as base.

A ratchet wheel 18 is fixed on a spoke 2a of each of right and left wheels while a pawl member 23 is provided on a body frame 1 near the ratchet pawl 18 so that the pawl member 23 can be engaged with the ratchet wheel to allow rotation in a fixed direction. On the other hand, an operation lever is provided on the body frame near an armrest to make the operation lever interlock the pawl member 23. The pawl member 23 is switched to engage with the ratchet wheel or not to engage with the ratchet wheel by the operation of the operation lever.