a first connector housing;

a second connector housing;

a lever which is rotatably provided on the first connector housing and which can fit or separate the first connector housing and the second connector housing by a rotating operation;

a flexible lock arm provided on the first connector housing and extending in a fitting direction of the first connector housing to the second connector housing;

a locking protrusion provided on the lever;

a locking part which is provided on a free end side of the flexible lock arm and whose rear end side is capable of locking so as to be hooked to a rear end part of the locking protrusion; and

a release operation part provided adjacent to the locking part and positioned below the lever at a time of locking the locking part with the locking protrusion, the release operation part being capable of releasing a locking state of the rear end part of the locking protrusion and the rear end side of the locking part; and

a connecting bridge of a front U-shape provided on a fixed end side of the flexible lock arm, wherein

the flexible lock arm is provided to extend in a side L-shape and in a plan U-shape from a lower face of a center connecting part of the connecting bridge,

the locking part is provided at a center on the free end side of the flexible lock arm, and

the release operation part is provided to be adjacent to both sides of the locking part.