A massage machine includes a body supporting portion which supports a body of a person to be treated and a massage mechanism which moves inside the body supporting portion along a body height direction of the person to be treated. The body supporting portion is divided in the body height direction into a base portion and a movable portion. The body supporting portion extends and contracts when the movable portion moves relative to the base portion. The massage machine is capable of adapting to the body size of the person to be treated by changing the treatment range of the massage mechanism by extending or contracting the body supporting portion.