The massage mechanism includes inner treatment elements, outer treatment elements and a driving device that drives the treatment elements. A distance between the inner treatment elements and the outer treatment elements is changed by the driving device. A first supporting shaft supports the inner and the outer treatment elements and is rotated about an axial center by the driving device. The first supporting shaft includes inner inclined shafts that support the inner treatment elements via an arm and outer inclined shafts that support the outer treatment elements via the arm. The massage mechanism is configured to be movable from a backrest part to a footrest part via a seat part.
