It is designed to provide a kind of chicken flavor composition and chicken flavor hardening agent, and enhances and assigns that the composition can be improved chicken flavor and food, beverage or flavouring include the composition or reinforcing agent. The present invention relates to chicken flavor compositions, and containing a kind of chicken taste booster 1,5-octadien-3-ol and/or 1,5-octadien-3-one, food, beverage or flavouring include the composition or reinforcing agent.