Abstract: Deflection spaces for allowing the deflection of male terminals are formed respectively in those portions of a connector housing of a male connector disposed near respectively to proximal end portions of the male terminals. A thinned portion is formed at that portion of each male terminal (of the male connector) disposed in the deflection space, and this thinned portion is smaller in thickness than its connection portion for connection to a female terminal. During the fitting of the connectors, the thinned portions of the male terminals are deflected within the deflection spaces, and therefore strains of various portions of the connectors, developing during the fitting of the connectors due to a positional error and a mounting error of upper and lower printed circuit boards, can be absorbed.