Provided is a sustained release pheromone preparation used for the control of insect pest, which can maintain a high release rate of a pheromone substance during the control period of the insect pest which has, as the pheromone substance, a C20-35 aliphatic hydrocarbon compound having such a melting point that the aliphatic hydrocarbon is in a solid form at normal temperature. More specifically, provided is a sustained release pheromone preparation comprising a membrane of an ethylene-vinyl acetate copolymer, and a C20-35 aliphatic hydrocarbon compound which is carried by the membrane, is permeable through the membrane, and has such a melting point that the aliphatic hydrocarbon compound is in a solid form at normal temperature, wherein the preparation targets an insect pest having the aliphatic hydrocarbon compound as a pheromone substance.
