A connector (1, 1A), comprising: a housing that houses a connection terminal; an outer case (51, 51A) that houses and holds the housing; a movable case (31, 31A) that includes first cam grooves (37,37A) formed penetratingly in side walls (35, 35) of the movable case corresponding to each of both side walls (54, 55) of the outer case (51, 51A), and that is movably disposed inside the outer case (51, 51a) in a connector fitting direction; a shutter (41, 41A) including a shutter front wall that covers a front opening of the housing to which a mating connector is fitted, shutter side walls (45, 45) provided at both end portions of the shutter front wall, and shutter bosses projecting to outer surfaces of the shutter side walls (45, 45) and engaging with the first cam grooves (37, 37A); and a spring that elastically urges the movable case (31, 31A) toward a side of the mating connector, wherein the first cam grooves (37, 37A) engage with the shutter bosses, such that the shutter (41, 41A) is rotated in an opening and closing direction around the shutter bosses in conjunction with the movable case (31, 31A) moving, characterized in that the connector (1, 1A) further comprises: third cam grooves provided on the both side walls (54, 55) of the outer case (51, 51A), and engaging with the shutter bosses such that the shutter (41, 41a) is moved along the connector fitting direction with respect to the outer case (51, 51A) in conjunction with the movable case (31, 31A) moving; movable case bosses projecting to inner surfaces of the side walls (35, 35) of the movable case; and second cam grooves (48, 48A) that are formed on the shutter side walls (45, 45) of the shutter and engage with the movable case bosses to support a rotation of the shutter (41, 41A) that moves along the connector fitting direction. a housing that houses a connection terminal; an outer case (51, 51A) that houses and holds the housing; a movable case (31, 31A) that includes first cam grooves (37,37A) formed penetratingly in side walls (35, 35) of the movable case corresponding to each of both side walls (54, 55) of the outer case (51, 51A), and that is movably disposed inside the outer case (51, 51a) in a connector fitting direction; a shutter (41, 41A) including a shutter front wall that covers a front opening of the housing to which a mating connector is fitted, shutter side walls (45, 45) provided at both end portions of the shutter front wall, and shutter bosses projecting to outer surfaces of the shutter side walls (45, 45) and engaging with the first cam grooves (37, 37A); and a spring that elastically urges the movable case (31, 31A) toward a side of the mating connector, wherein the first cam grooves (37, 37A) engage with the shutter bosses, such that the shutter (41, 41A) is rotated in an opening and closing direction around the shutter bosses in conjunction with the movable case (31, 31A) moving, characterized in that the connector (1, 1A) further comprises: third cam grooves provided on the both side walls (54, 55) of the outer case (51, 51A), and engaging with the shutter bosses such that the shutter (41, 41a) is moved along the connector fitting direction with respect to the outer case (51, 51A) in conjunction with the movable case (31, 31A) moving; movable case bosses projecting to inner surfaces of the side walls (35, 35) of the movable case; and second cam grooves (48, 48A) that are formed on the shutter side walls (45, 45) of the shutter and engage with the movable case bosses to support a rotation of the shutter (41, 41A) that moves along the connector fitting direction. third cam grooves provided on the both side walls (54, 55) of the outer case (51, 51A), and engaging with the shutter bosses such that the shutter (41, 41a) is moved along the connector fitting direction with respect to the outer case (51, 51A) in conjunction with the movable case (31, 31A) moving; movable case bosses projecting to inner surfaces of the side walls (35, 35) of the movable case; and second cam grooves (48, 48A) that are formed on the shutter side walls (45, 45) of the shutter and engage with the movable case bosses to support a rotation of the shutter (41, 41A) that moves along the connector fitting direction.