Abstract: A swing-in-swing-out chair apparatus for a bathtub-showerstall unit, or the like, and comprising a bar adapted to be disposed on the floor adjacent the outer periphery of the bathtub, an upright post extending from the bar to a position above the upper edge of the bathtub and pivotal about its own longitudinal axis, a seat support arm assembly secured to the upright post and movable therewith, a seat member secured to the support arm assembly and movable between an exterior position with respect to the bathtub-shower stall unit and an interior position with respect to the bathtub-shower stall unit and an interior position with respect thereto, and an anchoring apparatus carried by the upright post for securely and removably anchoring the swing-in-swing-out chair apparatus to the sidewall of the bathtub-shower stall unit, the apparatus being particularly designed for transfer of the weight of the occupant of the seat to the floor at all times for assuring stability for the occupant and apparatus.