A back rest device for a bathtub comprising a rest member having a front surface and a back surface, at least one suction cup, a cover with pockets, and at least one insertable pillow. The rest member is placed against a bathtub back and on a cushioned bathmat that suctions to the floor of the bathtub. The suction cups are attached to the back surface of the rest member to facilitate the attachment of the rest member to the bathtub back. The cover with pockets is attached to the front surface of the rest member and the insertable pillow is placed inside the pockets to create additional comfort.