First and second connector housings (10, 40) are connected by displacing a force multiplying member (24). The first housing (10) includes a pair of detection terminals (13) and a shorting member (19). The shorting member (19) is displaced between a shorting position where the detection terminals (13) are shorted and a releasing position where the detection terminals (13) are released from a shorted state. The force multiplying member (24) includes a pressing surface (29) that is parallel to a displacing direction of the force multiplying member (24). The pressing surface (29) displaces the shorting member (19) to the shorting position in a partly connected state where the two housings (10, 40) have not reached a completely connected state while displacing the shorting member (19) to the releasing position when the two housings (10, 40) reach the completely connected state.