The present invention relates to [1] a pest repellent whose surface tension at 25°C is 40 mN/m or less, and the viscosity at 23°C measured by a B-shaped rotary viscometer is 1200 mPa·s or less, and One or more liquid oily ingredients selected from the group consisting of silicone oils, ester oils, ether oils, hydrocarbon oils, aliphatic higher alcohols with a carbon number of 14 or more, and polyols as active ingredients； [2] a pest Repellent composition, which contains the above-mentioned liquid oily ingredient, and does not contain an effective amount of other pest repellents； and [3] A method of repellent pests, which comprises the above pest repellent or pest repellent composition The amount of liquid oily ingredients should be applied to the surface of human skin in a manner of 0.1 mg or more per 1 cm 2 . The pest repellent of the present invention has an excellent repellent effect on pests, especially flying pests, is safe and has less odor.本發明係關於一種[1]害蟲忌避劑，其於25℃下之表面張力為40 mN/m以下，利用B形旋轉黏度計所測之23℃下之黏度為1200 mPa・s以下，並將選自由矽酮油、酯油、醚油、烴油、碳數14以上之脂肪族高級醇、及多元醇所組成之群中之1種以上液狀油性成分作為有效成分；[2]一種害蟲忌避組合物，其含有上述液狀油性成分，且不含有效量之除此以外之害蟲忌避劑；及[3]一種害蟲之忌避方法，其係將上述害蟲忌避劑或害蟲忌避組合物以上述液狀油性成分之量成為每1 cm20.1 mg以上之方式塗抹於人之皮膚表面。本發明之害蟲忌避劑對害蟲、尤其是對飛翔害蟲之忌避效果優異，安全且臭氣少。
