A connector (relay connector 10) disclosed by this specification includes a first housing 21 having a terminal accommodating portion 24 into which first terminals 22 are to be accommodated, a second housing 51 including a receptacle 52 into which the first housing 21 is to be accommodated, the receptacle 52 being annularly continuous over an entire periphery, rubber plugs 30 fixed to the first terminals 22 and accommodated inside a rubber plug accommodating portion 25 provided to project rearward from a rear surface 24A of the terminal accommodating portion 24, and a potting agent 60 filled between an inner peripheral surface of the receptacle 52 and an outer peripheral surface of the first housing 21.