Abstract: A portable massage unit which is attachable to a chair, sofa, vehicle seat and the like, which includes an elongated plate member assembly having several massage protrusions on one side thereof for massaging the back of the user's body and on the other side thereof for massaging a body part such as a hand, arm, foot, leg and thigh by swinging the plate member assembly relative to a base plate member by an electric motor and crank mechanism. By connecting the two members with a flexible plate, reciprocating movement is further provided to the elongated plate member in the longitudinal direction. The plate member may provide further delicate massage performance by mounting several leaf springs thereon, each having at least one protrusion.