PROBLEM TO BE SOLVED: To provide an insect repellent that has sufficient repellent effect for an insect pest, has a high level of safety for a human body, has a high level of stability, and can be used easily and simply in even general households.SOLUTION: This invention provides an insect repellent comprising one or more pyrazine compound as an active ingredient and an insect pest repelling method characterized by applying the insect repellent to an insect pest.