It is to provide a novel fungicide having high controlling effects on plant diseases particularly on wheat powdery mildew and cucumber gray mold, without ill effects on crops. A carbamate derivative represented by the general formula ÄIÜ äwherein X is a halogen atom, a C1-C6 alkyl group or the like, n is 0 or an integer of from 1 to 4, R<1> is a C1-C6 alkyl group, R<2> is a hydrogen atom, a C1-C6 alkyl group or the like, R<3> is a hydrogen atom or a C1-C6 alkyl group, G is an oxygen atom, a sulfur atom or the like, Y is a hydrogen atom, a C1-C10 alkyl group, C2-C10 alkenyl group or the like, and Q is a hydrogen atom, a C1-C6 haloalkyl group, a phenyl group or the likeü and an agricultural/horticultural fungicide containing the same as the active ingredient.