Patent ID: 7201218

Claim:
A header tank for a heat exchanger in which a plurality of flat tubes are communicated and connected to at least a pair of the header tanks so as to form multiple stages, the header tank comprising: a pipe having a first separated body and a second separated body; and a pair of closing members for closing opening portions in both ends of the pipe, wherein the first separated body includes a tube holding wall portion having insertion holes for holding the flat tubes and a pair of straight portions approximately parallel to one another, wherein the straight portions and the tube holding wall portion are formed in a C-shaped cross sectional shape, wherein the second separated body includes a main body portion closing an opening portion of the first separated body, abutment portions provided in both ends of the main body portion and abutted on leading end surfaces of the straight portions of the first separated body, and joint projections protruded from the main body portion and bonded to inner peripheral surfaces of leading end portions of the straight portions, wherein a width of the second separated body in a direction orthogonal to a longitudinal direction of the tube does not exceed a width of the first separated body in the direction orthogonal to the longitudinal direction of the tube, and wherein the leading end portions of the straight portions are accommodated in a space defined by the joint projections and the abutment portions.