The present invention provides a insect-proofing agent, which has high insect-proofing effect, at the same time, can display using terminal definitely due to the volatilization of normal temperature volatility medicament and the sublimation of subliming material end at one time, also manufacturability is excellent. The insect-proofing agent is characterized in that it contains medicament carrier by pliability bag, the medicament carrier is made by making one or two normal temperature volatility medicament selected from the eneyne pyrethrin, tetrafluoro pyrethrin, bingfu pyrethrin and methoxy benzyl fluorine pyrethrin to be carried on subliming material with 0.5 to 2.0 percent by weight. The two or single surface of the pliability bag is coated with japanese paper or non-slub cloth of 10 to 50g/m<2> and medicament permeance film which wall thickness is 10 to 30 [mu]m, under the state of single surface, the other surface is formed by non permeating film, and at least parts of the medicament carrier can contact to the inner surface of the pliability bag even though the medicament carrier reduces along with the sublimation of the subliming material, thus, the using terminal can be identified by watching the disappear state of the medicament carrier.
