a shower bench apparatus includes a positively engagable non - tipping chair and an easily operable clamping mechanism for attaching the apparatus to the side of a bathtub . the seat of the chair includes a pair of front hook - like brackets for engaging a first rail of the bench and a pair of craddle - like brackets near the rear of said seat for engaging the second rail of the bench . locking screws are used to positively attach the rear craddling brackets to the second rail . it is virtually impossible to tip the chair over backwards due to the positive engagement of the front hook brackets . the chair may be reversed 180 ° and repositioned with a minimum of effort . the device is readily clampable to the edge of a bathtub by means of a clamping mechanism driven by a single , easily manipulatable knob .