An inlet member having a refrigerant inflow passage which is open at opposite ends is joined to a condensation section inlet header of a condenser. An opening at one end of the refrigerant inflow passage serves as an inflow opening into which externally supplied refrigerant flows, and an opening at the other end serves as an outflow opening from which refrigerant flows out to the condensation section inlet header. The condensation section inlet header has an opening at a position offset from the longitudinal center toward the one end thereof. The inlet member has an insert portion which is inserted into the condensation section inlet header through the opening. The outflow opening of the refrigerant inflow passage is open to a single upward facing flat surface of the insert portion, and is oriented such that the refrigerant flows toward the longitudinal center of the condensation section inlet header.