A fitting guide portion is provided between a male connector housing and a hood, and guides a male connector in a normal fitting direction with respect to a female connector in response to a load in a direction inclined with respect to the female connector and applied to the male connector by a rotating operation of a lever. The fitting guide portion includes a guide rib provided in one of inner walls of the male connector and the hood and a rib guide groove provided in the other of the inner walls and for the guide rib to be inserted.