A connector includes: a case-shaped attachment member including a through-hole; a first housing including a first fitting portion accommodating a first terminal; and a second housing including a second fitting portion accommodating a second terminal. The first housing includes an outer housing and an inner housing. The inner housing is assembled to be movable in the fitting direction and is provided with the first fitting portion. The inner housing is provided with a pressing rib. Between the pressing rib and outer housing a second seal member is provided for sealing between the outer and inner housings. A restricting portion which comes into contact with the pressing rib to restrict movement of the pressing rib in the fitting direction is provided in a side of the through-hole closer to the inside of the attachment member.