Patent ID: 7918266

Claim:
A heat exchanger comprising a refrigerant inlet header section and a refrigerant outlet header section which are arranged in parallel in a front-rear direction, and a refrigerant circulation passage for establishing communication between the header sections, wherein a refrigerant inlet is formed in the refrigerant inlet header section at a first end, and a refrigerant outlet is formed in the refrigerant outlet header section at the same end; and refrigerant having flowed from the refrigerant inlet into the refrigerant inlet header section returns to the refrigerant outlet header section after passing through the refrigerant circulation passage, and flows out of the refrigerant outlet, wherein the first ends of the refrigerant inlet header section and the refrigerant outlet header section are closed by a first cap joined to the two header sections while bridging them, and second ends of the refrigerant inlet header section and the refrigerant outlet header section are closed by a second cap joined to the two header sections while bridging them; the refrigerant inlet is formed in a portion of the first cap which closes the refrigerant inlet header section, and the refrigerant outlet is formed in a portion of the first cap which closes the refrigerant outlet header section; a pipe joint member having a refrigerant inflow portion communicating with the refrigerant inlet and a refrigerant outflow portion communicating with the refrigerant outlet is joined to the first cap; a mating concave portion is formed on the first cap, and a mating convex portion is formed on the pipe joint member such that the mating convex portion projects toward the first cap and is fitted into the mating concave portion; and the mating concave portion, into which the mating convex portion is fitted, is not formed on the second cap.