An electric wheelchair, comprising a controller, a seat, front wheels, rear wheels, and a supporting transmission component, which comprises a base bracket, a main supporting frame, a front connecting rod, and a rear driving push rod, the front connecting rod and the rear driving push rod are arranged sequentially in a front-rear direction, an upper end of the main supporting frame is rotatably connected to the seat, a lower end is connected to the front wheels, a front end of the base bracket is rotatably connected to the lower end of the main supporting frame, a rear end is connected to the rear wheels, both ends of the front connecting rod are connected to the seat and the lower end of the main supporting frame, respectively, both ends of the rear driving push rod are rotatably connected to the upper end of the main supporting frame and the base bracket.

A mobility support device capable of stably climbing a step without impairing mobility on flat ground is provided. The mobility support device includes a front wheel, a rear wheel, a drive wheel disposed between the front wheel and the rear wheel, a first link coupled to the front wheel, a second link connecting the drive wheel and the rear wheel, a rotation joint coupling the first link and the second link at a first position, and a first elastic member coupling the first link and the second link at a second position different from the first position.