PURPOSE: A connector is provided to solidly couple the first connector with a receptacle terminal by one-time assembling of a retainer, thereby quickly performing an assembling work. CONSTITUTION: A receptacle terminal(20) in which an insertion groove is formed is arranged in the inside of the first connector(10). A hook hole(11) is formed in the outer surface in which the insertion groove is located. The second connector(30) comprises the following units. A retainer(31) inserted into the hook hole and the insertion groove is formed in the end of an elastic piece.
