A connector includes a first housing, a second housing, and a fitting assurance member attached to the second housing and movable relative to the second housing in a state in which the first housing and the second housing are fitted to each other. The first housing includes a lock protrusion, and a first inclined surface and a second inclined surface. The first inclined surface and the second inclined surface are provided on opposite sides. The second housing includes a lock arm to lock the lock protrusion in the fitted state. The fitting assurance member includes a first repulsive arm to generate repulsive force when the first repulsive arm is elastically deformed by the first inclined surface during a fitting operation. The second housing includes a second repulsive arm to generate repulsive force when the second repulsive arm is elastically deformed by the second inclined surface during the fitting operation.