The heat exchanger of the present invention has a plurality of hollow fiber membranes, a hollow fiber membrane layer in which the plurality of hollow fiber membranes are integrated, and both ends of the hollow fiber membrane from the outside of the hollow fiber membrane. A heat exchanger including a fixing portion to be fixed, wherein the fixing portion mainly includes polyurethane, and the hollow fiber membrane is provided on a heat conductive layer including high-density polyethylene and outside the heat conductive layer, and the fixing And a bonding layer mainly containing a modified polyolefin resin.本発明の熱交換器は、複数本の中空糸膜を有し、該複数本の中空糸膜が集積された中空糸膜層と、前記中空糸膜の両端部を前記中空糸膜の外側から固定する固定部とを備える熱交換器であって、固定部は、主としてポリウレタンを含み、中空糸膜は、高密度ポリエチレンを含む熱伝導層と、前記熱伝導層の外側に設けられ、前記固定部に対して接着され、主として変性ポリオレフィン系樹脂を含む接着層と、を有することを特徴とする熱交換器。
