An object of the present invention is to provide an insect pest control tool capable of adjusting the amount of evaporation of an included medicinal ingredient to an optimal state in order to exert a control effect on unpleasant insect pests, sanitation insect pests, and the like. An insect pest control device comprising: An agent containing an essential oil or an essential oil-derived component, and a liquid isoparaffin-based hydrocarbon; a body container containing the agent; and a volatile film made of low density polyethylene sealing an opening of the body container, wherein the gas permeability of the volatile film is 1000 000 cc/ (m 2 24 hr ATM) in 23 degrees graph. Figure 1

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