A connector has a detector (11) is provided in a housing (10) for movement in a front-rear direction, and can move from a standby position to a detection position when the housing (10) is connected properly to a mating housing (90). The detector (11) includes two side walls (53) arranged to face each other in a width direction with a lock arm (15) provided on the housing (10) therebetween. A detecting body (42) is assembled with the lock arm (15) between the side walls (53) and can tilt together with the lock arm (15). Couplings (59) have tilting fulcrums (66) configured to resiliently deform when the detecting body (42) is tilted. The couplings (59) extend in oblique directions intersecting the width direction from the side walls (53) to corresponding side surfaces of the detecting body (42).