A new imidazole compound is now provided, which is represented by the general formula ##STR1## wherein R.sub.1 is naphthyl group, an arylalkyl group, a cycloalkyl group, a cycloalkylalkyl group, an alkyl group, a lower alkenyl group, a lower alkoxy-lower alkyl group or a phenylthio-lower alkyl group or phenyl group or a substituted phenyl group;R.sub.2 is an unsubstituted or substituted alkyl group or an alkenyl group or an alkynyl group, naphthyl group, or an unsubstituted or substituted phenyl group;X is an oxygen atom or a sulfur atom; andY is an unsubstituted or substituted alkylene group or an unsubstituted or substituted alkenylene group. The new imidazole compound and its salt show a usefully high fungicidal activity against a wide variety of fungi which infest crop plants. The new imidazole compound and its salt may be useful as fungicidal agent of agricultural and horticultural usages.