There are provided triazole derivatives represented by a general formula ##STR1## (wherein R.sup.1 is an alkyl group having a carbon number of 1-4, R.sup.2 is a phenyl group substitutable with a halogen atom, an alkyl group having a carbon number of 1-4 or the like, R.sup.3 is an alkenyl group having a carbon number of 3 or more substitutable with 1-4 halogen atoms, a phenyl group substituted with 1 or more halogen atoms or the like), a method producing the same, and a pest controlling agent containing the same as an active ingredient.The triazole derivatives according to the invention have an excellent insecticidal action against harmful pests such as hemipteran insects, lepidopteran insects, dipteran insects, mites and the like and also have an excellent ovicidal action against eggs of these pests. Furthermore, they have a preventively controlling effect on serious diseases such as sheath blight, blast and the like without badly affecting crops.