CONTROL VALVE, FLOW RATE CONTROL VALVE, AND TWO-MEMBER CONNECTING STRUCTURE

A control valve for use in a heat exchange circuit of an engine of an automobile includes a housing and a connection pipe. The housing includes a communication port structured for introduction or discharge of fluid. The connection pipe is fastened to the communication port of the housing with a fastening member. The housing is made of resin. Each of the connection pipe and the fastening member is made of material, such as metal, less in linear expansion coefficient than the housing.