The back kneading device mounted in the chair-type massage apparatus comprises: the massage mechanism including paired right-hand and left-hand massage members having the treatment element for massage and the driving section for transmitting massage action to the massage member the base member for supporting the massage mechanism, with the massage member pointing forward the vertical movement mechanism for moving the base member in the vertical direction in the backrest and the protruding-amount varying mechanism for moving the massage member so that protrusion amount of the treatment element in the front-rear direction can be varied.
