The present invention relates to a device for tightly closing the opening (4) of the bathtub (2) of a cabin hydromassage (1) with the aid of a sliding panel (5), comprising a supporting structure (6) with respect to which the panel (5) slides in translation with the aid of a drive means (12, 15) from a low position (5 ′) of the release of the opening (4) to a high position (5 ") of the opening (4), the support structure (6) comprising two vertical rails (8a, 8b), each provided with a path (16) of the reception of the panel (5), each path (16) being provided with a constriction the top (19) and a throttling the bottom (18) in order to impart to the panel (5) a displacement towards the opening (4), characterized in that the drive means (12, 15) comprises an endless screw (11) is actuated by a motor (15), the screw (11) being engaged in a nut (13) attached to the panel (5).
