The present invention provides an easy-to-use, inexpensive attraction tool useful for hunting. The present invention relates to a heat exchanger comprising an exothermic composition containing an oxidation accelerator having an iodine adsorption amount of 700 g / kg or less, an oxidizable metal powder and water, and an attractant, wherein at least the exothermic composition has air permeability Provide an attractor that is housed in a bag.本発明は、使い勝手が良く、安価で、狩猟に有用な誘引具を提供する。本発明は、よう素吸着量700g/kg以下の酸化促進剤、被酸化性金属粉及び水を含有する発熱性組成物ならびに誘引物質を含有し、少なくとも前記発熱性組成物が通気性を有する収容袋に収容されてなる誘引具を提供する。
