A connector (1) is provided between both portable LP gas storing cylinders when transferring and charging LP gas from this to that. One retainer (6) for a supplying LP gas cylinder (2) is positioned on an upper surface of a connector main body (5) which houses a flow passage opening and closing valve (4). The other retainer (7) for a receiving LP gas cylinder (3) is arranged on a lower surface of the connector main body (5). The upper surface of the connector main body (5) is opened at a mid portion of the one retainer (6) to provide an LP gas receiving inlet (14), which communicates with an LP gas taking outlet (23) provided by opening the lower surface of the connector main body (5) at a mid portion of the other retainer (7) through the flow passage opening and closing valve (4).