A
wheelchair device, comprising a seat, a backrest and an adjusting mechanism, the adjusting mechanism comprising a bearing structure, a supporting structure and a
coupling structure, the supporting structure comprising a transmission
assembly and a supporting plate, the seat being connected with the bearing structure, the bearing structure being provided with a first rotating part and a second rotating part, the supporting plate being rotatably connected with the first rotating part through a rotating shaft, the transmission
assembly being installed on the supporting plate, the second rotating part and the transmission
assembly being rotatably connected with the
coupling structure respectively, the backrest being slidably connected with the front face of the supporting plate, the backrest being drivingly connected with the transmission assembly; when the included angle between the supporting plate and the seat increases, the backrest slides on the supporting plate towards the direction close to the rotating shaft; when the included angle between the supporting plate and the seat decreases, the backrest slides on the supporting plate towards the direction away from the rotating shaft.