The invention provides a mosquito repellent for preventing infectious disease medium mosquito, with excellent effect for infectious disease medium mosquito such as Aedes aegypti, Culex fatigans, anopheles and so on, and excellent safety to the human ans domestic animal and low cost. The mosquito repellent comprises 0.1-0.5 weight% of (S)-2-methyl-4-oxy-3-(2-allylene)-2-cyclopentenyl(1R)-antiform- chrysanthemum monocarboxylate, preferably used as heat and evapotranspiration accelerant, ralative to the active ingredient, comprising 1.0-5.0 times of N-(2-ethylhexyl)-double ring-[2,2,1]-age-5-olefin-2,3-dicarboximide.
