Abstract: An apparatus to massage a person's back which may be incorporated into a chair, or the like, and having a frame having a plurality of movable slats mounted transversely thereon and having a cover thereover. An electric motor is mounted to the frame and is operatively connected to an elongated cam rotably supported on the frame for rotation by the electric motor. The elongated cam is mounted adjacent to said plurality of slats and forms a helix on a shaft connected to the electric motor so that rotation of the elongated cam will raise and lower individual slats responsive to the cam pushing thereagainst.