A four-legged animal wheelchair 1A used for a four-legged animal, comprising: a ring frame 2 attached to a body of the four-legged animal near impaired limbs; a plurality of wheel support members 3 that are slidably provided along an outer circumference of the ring frame 2 and rotatably support wheels 4; and wheel displacement mechanisms 5 for displacing, when the four-legged animal changes from an upright state to a side-lying state, a plurality of the wheels 4 to positions in the upright state.