A housing (10) for an electronic control unit is disclosed. It comprises a main body (11) having a base (15) and a wall (18) rising from the base (15), a cover (12) supported on the wall (18) opposite to the base (15) and fixed to the housing (10) for defining an inner volume (13), a seat (19) on the wall (18) for a sealant (40) interposed between the main body (11) and the cover (12) contributing to isolate the inner volume (13) from an outer volume (A). The seat (19) comprises a portion (19b) adjoining the inner volume (13) or the outer volume (A), said portion (19b) having an edge (31) on said wall (19) inclined with respect to the cover (12).