Patent ID: 8002023

Claim:
A heat exchanger for exchanging heat through a heat transfer plate by flowing a primary air current and a secondary air current to a ventilation path; the heat exchanger comprising: a plurality of unit elements, each including a corresponding heat transfer plate and the ventilation path formed between adjacent heat transfer plates by stacking the unit elements in plural, wherein each of the unit elements is configured by integrally molding a spacing rib for holding a spacing of two of adjacent heat transfer plates, and a shield rib for shielding leakage of the air current with resin; and each of the unit elements includes a stacking error detecting unit for determining a stacking error when the plurality of unit elements are stacked, wherein the stacking error detecting unit includes a concave part and a convex part on at least one of the spacing rib and the shield rib, the convex part of a first of the plurality of unit elements is located within the concave part of a second of the plurality of unit elements when the plurality of unit elements are stacked alternately offset, and wherein a bottom of the second of the plurality of unit elements contacts the top of either the spacing rib or the shield rib of the first of the plurality of unit elements and a space is defined between the top of a stacking check convex part of the first of the plurality of unit elements and the bottom of a pass through hole concave part of the second of the plurality of unit elements adjacent to the first of the plurality of unit elements.