A lever connector includes a housing, and a lever rotatably provided on the housing to be rotated in a locking direction to be disposed at a connection locking position. The lever includes support plate portions rotatably supported by both sides of the housing, each support plate portion has a protrusion portion protruding toward a side of the housing, the both sides of the housing have groove portions with which the protrusion portions of the lever at the connection locking position are engaged, each groove portion has a tapered surface inclined in a protruding direction of a protrusion portion as extending in the locking direction of the lever, and as the protrusion portions are slid along the tapered surfaces to be engaged with the tapered surfaces, respectively, the lever is applied with a rotating force in the locking direction.