PROBLEM TO BE SOLVED: To provide a heat exchanger for dehumidification which can realize dehumidification such that indoor dew condensation can be prevented with a less energy.SOLUTION: A heat exchanger 1 for dehumidification is equipped with: a three-dimensional body part 2 having a first end 21 and a second end 22 which are opposite to each other； plural indoor air passages 3 which move indoor air toward the second end 22 from the first end 21； and plural outside air passages 4 which move outside air toward the first end 21 from the second end 22. At least a part of each of the plural indoor air passages 3 and at least a part of each of the plural outside air passages 4 are adjacent to each other at at least a part of the body part in a thickness direction and a width direction. An outside air temperature, which is a temperature of outside air, is lower than an inside air temperature which is a temperature of inside air, and the outside air temperature cools indoor air, which moves in the plural inside air passages 3, to a dew point temperature by out side air which moves in the outside air passage 4.SELECTED DRAWING: Figure 3【課題】少ないエネルギーで室内の結露を防止できる除湿を実現する除湿用熱交換器を提供する。【解決手段】除湿用熱交換器１は、対向する第１端部２１および第２端部２２を有する立体状の本体部２と、第１端部２１から第２端部２２に向けて室内空気を移動させる複数の室内空気通路３と、第２端部２２から第１端部２１に向けて外気を移動させる複数の外気通路４と、を備え、複数の室内空気通路３のそれぞれの少なくとも一部と、複数の外気通路４のそれぞれの少なくとも一部とは、本体部の厚み方向および幅方向の少なくとも一部で隣接し、外気の温度である外気温度は、室内空気の温度である室内空気温度より低く、外気温度は、複数の室内空気通路３を移動する室内空気を、外気通路４を移動する外気によって、露点温度に冷却する。【選択図】図３
