A transmission housing (2) of the type including two housing elements (9) that can be positioned to press against each other and that in the assembled-together state define: a cavity (13)； a shaft (6) projecting at least in part from the housing (2)； a motion transmission mechanism (30) for transmitting motion to said shaft (6), the motion transmission mechanism (30) being housed at least in part inside the cavity (13) of the housing (2)； and sealing means (15) arranged in the zone where the housing elements (9) are pressed together and referred to as a join plane (10), the sealing means (15) surrounding said cavity (13).The housing (2) comprises means (17) for connecting the housing elements (9) together by snap-fastening in order to hold the housing elements (9) pressed against each other and the sealing means (15) comprise adhesive connection means (16) for connecting said housing elements (9) together.
