The present invention provides a tetrazoyloxime derivative or salt thereof, represented by the following formula (1): [wherein, R1 represents an optionally substituted C1-C6 alkyl group etc., q represents an integer of 0 to 5, A represents a tetrazoyl group represented by the following formula (2) or (3): and D represents a group represented by the following formula (4) or (5): (wherein, R2 represents a halogen atom etc., n represents an integer of 0 to 3, R3 represents a hydrogen atom etc., R4 represents a hydrogen atom etc., Q represents an optionally substituted C1-C20 alkyl group etc.)], and a plant disease control agent.