To prevent loosening of a connector from a securing groove part of a structural frame member by ensuring a connected fixed state of the connector for the structural frame member.

The connector includes a pair of right and left housings, a movable body, an edge cover, and a pressing bolt moving the movable body between a connection fixing position wherein a pressing piece of the movable body is inserted between opposing securing ratchets in the pair of right and left housings by being screwed into a nut part provided in the edge cover and abutting on a bottom face of the securing groove part of the structural frame member, and a connection release position wherein the pressing piece is withdrawn from between the opposing securing ratchets in the pair of right and left housings and positioned in a movable space by releasing screwing with respect to the nut part provided in the edge cover.