To provide a tooth brush making a motion of a brush part gentle and a motion of a hand auxiliary in tooth brushing operation.

This tooth brush consists of a brush part 2 and a handle part 1 extending from the brush part 2. The handle part 1 has a shaft core part extended coaxially with the brush part 2, a grip part in which the shaft core part is inserted and which can reciprocate along the axial direction of the shaft core part, a cushion member arranged on both sides in the direction of travel of the grip part, and a locking part nipping the cushion member between the grip part and it.