An insect trap comprises an exothermic body, and a layered body. The exothermic body is configured to comprise exothermic powder enclosed in an inner bag that is air permeable； the exothermic powder contains iron powder that releases heat when oxidized. The layered body is configured with layers of plate-like elements and comprises gaps as a pathway of entry for an insect pest. A housing space to house the exothermic body is arranged inside the layered body. The layered body and the inner bag are made of a biodegradable raw material.
