Patent ID: 7757752

Claim:
A heat exchanger, comprising: a first structure and a second structure that form a fluid-flux portion for making a fluid flow, the second structure being provided on a heat source side with respect to the first structure; and a corrugated plate stored in the fluid-flux portion, the second structure having a groove corresponding to a portion, of the corrugated plate, at a second structure side, wherein the corrugated plate includes a fold formed on the second structure side, and a length in a depth direction of the groove is longer than a bending radius of an outer circumference of the fold and shorter than twice the bending radius, the bending radius being half the length of an outside diameter of the fold, wherein the outside diameter of the fold is the distance from a first outer side of the corrugated plate at a point at which the fold begins to a second outer side of the corrugated plate at a point at which the fold ends, the first outer side being substantially parallel to the second outer side.