The invention provides a connector which includes: a connector body; a terminal mounted to the connector body; and a locking device mounted to the connector body. The connector body includes butt guide portions formed at both ends in the longitudinal direction of the connector body, wherein the butt guide portions is fitted to butt connector-side butt guide portions, and the butt connector-side butt guide portions are formed at both ends in the longitudinal direction of the butt connector body of a butt connector. The locking device includes sliders that are slidably attached to each of the butt guides in a longitudinal direction of the connector body, and each of the sliders includes a pair of locking projections at left and right. When the connector body is jointed with the butt connector body, each of the locking protrusions is engaged with a mating reinforcing bracket mounted to the butt connector body.