Chair-Type Massage Machine

Provided is a chair-type massage machine including an arm treatment portion. The arm treatment portion includes an arm insertion groove part that is open at an upper part thereof and an expansion/contraction part that is disposed in the arm insertion groove part and expands and contracts. The arm insertion groove part includes a placement surface, a pair of inner side surfaces that are disposed on an upper side of the placement surface, and an inclined side surface that is disposed so as to be continuous with an upper end of the inner side surface as one of the pair of inner side surfaces and is inclined at an upper part thereof toward the inner side surface as the other of the pair of inner side surfaces. The expansion/contraction part as at least one of expansion/contraction parts is at least partly disposed along the inclined side surface.