A wheelchair is constructed to be convertible into a push-cot. The wheelchair includes a main chassis and front and rear chassis that are removably received in the main chassis and are extendable in frontward and rearward directions. A reclining back frame is rotatably mounted to the rear side of the main chassis and is in driving coupling with the rear chassis so that when the rear chassis is extended, the reclining back frame is moved from a substantially upright position to a horizontal position to convert the wheelchair to a push-cot.