At least one of a housing and a pressing member has an inner peripheral surface to be held in close contact with an outer peripheral surface of a sealing member. The sealing member includes a sealing hole a cable being passed through the sealing hole, and recesses located closer to the outer peripheral surface than the sealing hole and open in at least one of the front and rear surfaces. At least one of the housing and the pressing member includes projections. If, out of an inner wall of the recess, a part located on the side of the outer peripheral surface is an outer lateral part and a part located on the side of the sealing hole s an inner lateral part, a clearance is formed between the projection and the inner lateral part and the projection is arranged in contact with the outer lateral part in the recess.