A tetrazoyloxime derivative represented by formula: wherein X represents a halogen atom, a C 1-8 alkyl group, a C 1-8 alkoxy group, a cyano group, a C 1-8 alkylsulfonyl group, a nitro group, a C 1-8 haloalkyl group, or an unsubstituted or substituted aryl group; n1 represents any one of integers of 0 to 5, and when n1 is 2 or more, X(s) may be the same or different with each other; A represents a tetrazoyl group represented by formula: (in which Y represents a C 1-8 alkyl group), or a tetrazoyl group represented by formula: (in which Y is the same as defined above); and Het represents a pyridyl group represented by formula: (in which at least one R represents a cyano group, a nitro group, a hydroxyl group, a thiol group, a formyl group, a carboxyl group, an unsubstituted or substituted amino group, an unsubstituted or substituted C 1-8 alkyl group, an unsubstituted or substituted C 2-8 alkenyl group, an unsubstituted or substituted C 2-8 alkynyl group, an unsubstituted or substituted aryl group, an unsubstituted or substituted heterocyclic group, OR 1, S m R 1, COR 1, or CO 2 R 1, R 1 represents an unsubstituted or substituted amino group, an unsubstituted or substituted C 1-8 alkyl group, an unsubstituted or substituted C 3-8 cycloalkyl group, an unsubstituted or substituted C 2-8 alkenyl group, an unsubstituted or substituted C 2-8 alkynyl group, or an unsubstituted or substituted aryl group, m represents any one of integers of 0 to 2, n2 represents any one of integers of 1 to 3, and when n2 is 2 or more, plural R(s) may be the same or different from each other, and, Z represents a hydrogen atom, an amino group, or a group represented by formula: Q 3 C(=O)NH- (in which Q 3 represents a hydrogen atom, a C 1-8 alkyl group, a C 1-8 haloalkyl group, a C 2-8 alkenyl group, a C 2-8 haloalkenyl group, a C 2-8 alkynyl group, a C 2-8 haloalkynyl group, a C 1-8 alkoxy group, a C 1-8 haloalkoxy group, a C 2-8 alkenyloxy group, a C 2-8 haloalkenyloxy group, a C 2-8 alkynyloxy group, a C 2-8 haloalkynyloxy group, a C 3-8 cycloalkyl group, a C 3-8 cycloalkyloxy group, a C 1-8 alkylamino group, a C 1-8 alkoxy group substituted with an unsubstituted or substituted amino group, a C 1-8 alkoxy group substituted with a C 3-8 cycloalkyl group, an unsubstituted or substituted aralkyloxy group, a C 1-8 alkoxy group substituted with an unsubstituted or substituted heterocyclic group, a C 1-8 alkoxy group substituted with an unsubstituted or substituted C 1-8 alkoxy group, a C 1-8 alkoxy group substituted with an unsubstituted or substituted aryloxy group, a C 1-8 alkoxy group substituted with an unsubstituted or substituted aralkyloxy group, a C 2-8 alkynyloxy group substituted with an unsubstituted or substituted aryl group, a C 1-8 alkoxy group substituted with an unsubstituted or substituted C 1-8 alkylthio group, a C 1-8 alkoxy group substituted with a substituted or unsubstituted arylthio group, a C 1-8 alkoxy group substituted with an unsubstituted or substituted C 1-8 alkylsulfinyl group, a C 1-8 alkoxy group substituted with an unsubstituted or substituted arylsulfinyl group, a C 1-8 alkoxy group substituted with an unsubstituted or substituted C 1-8 alkylsulfonyl group, a C 1-8 alkoxy group substituted with an unsubstituted or substituted arylsulfonyl group, an unsubstituted or substituted aryloxy group, a C 1-8 alkyl group substituted with a carboxyl group, a C 1-8 alkyl group substituted with an unsubstituted or substituted amino group, a C 1-8 alkyl group substituted with an unsubstituted or substituted aryloxy group, a C 1-8 alkyl group substituted with an unsubstituted or substituted C 1-8 alkylthio group, a C 1-8 alkyl group substituted with an unsubstituted or substituted alkoxy group, an alkyl group substituted with an acyl group, or a C 1-8 alkyl group substituted with an unsubstituted or substituted heterocyclicoxy group), and a salt thereof.