The present invention relates to a wheelchair comprising a frame (T), a pair of back pushing wheels (3). a pair of front wheels (4), a seat (S) and a pair of footrests (5) supported by said frame (T), being articulated and comprising a first rear half-frame (1), a second front half-frame (2) and an articulation and locking device (16) between rear half-frame (1) and front half-frame (2).