| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat exchanger to enable reduction of a content amount of a header as a sufficient pressure strength is ensured and enable ensuring of lightness not accompanied by an increase in weight. SOLUTION: The tube connection side of a hollow header 2 is formed in a flat wall part 10 and the tube non-connection side thereof in an arcuate wall part 11, the two sides being smoothly interconnected through a curve-form connection wall part 12. Parameters, such as a radius of curvature Ra of the outer surface of the flat wall part 10, a radius of curvature Rb of the outer surface of the connection wall part 12, and a radius of curvature r of the outer surface of the arcuate wall part 11, are set to a particular range.
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