through the upper frame 11 at the rear end thereof with this arrangement the apertures 52 may be indexed by the pin 53 to thus adjust the height of the back post the back post 51 is provided at its upper end with a horizontally extending armrest 54 and a push handle 55 for the wheel chair which extends in the direction opposite to the armrest a back sheet 56 is spread between the two back posts 51 to be removably mounted thereon by means of hooks 57 in folding the wheel chair the back sheet 56 is removed from the back posts and the pin 51 is also removed to then lower the back post and in alignment with one of the apertures to maintain the back post in position as shown in fig4 on the other hand if the front and rear lower frames 14 15 are folded the caster wheel 36 and the drive wheel 44 are moved toward the center of the wheel chair to reduce the latter in width by about 1 2 in fig7 and 8 there is shown a second embodiment of the invention wherein a vertical and hollow base post 112 has a slit 16 along its one wall and has a c shape the downwardly directed channel member 13 has at its outer wall a bracket 161 and a.