Patent ID: 7980296

Claim:
A heat exchanger, comprising: a housing including an inlet passage through which a fluid is introduced, an outlet passage from which the fluid is discharged, an inner communication space in which the fluid flows from the inlet passage to the outlet passage, and a plurality of unit plates of thin flat plates that are disposed in parallel to a flowing direction of the fluid, the plurality of unit plates layered in a direction to be substantially orthogonal to the flowing direction, the plurality of unit plates each having a fin in parallel to the flowing direction of the fluid, the fin having a side, a frame enclosing the fin and projecting in an out-of-plane direction of the fin, and holes respectively communicating with the inlet passage and the outlet passage, wherein heat is exchanged between a heating body attached on an outer surface of the housing and the fluid, the side of the fin of each of the plurality of unit plates is slanted relative to a projecting direction of the frame and is parallel to a side of each of the fins of the rest of the plurality of unit plates, and the unit plates each have a Z-shape cross section along the direction in which the unit plates are layered.