An agricultural fungicide contains, as an active ingredient thereof, at least one selected from the group consisting of nitrogen-containing heterocyclic compounds represented by formula (I) (wherein, R represents a group represented by CR1R2R3, R1to R3represents a hydrogen atom, an alkyl group, a hydroxyl group, or the like, X1represents a halogeno group or the like, m represents an integer of 0 to 5, X2represents a halogeno group or the like, n represents an integer of 0 to 3, B represents a carbon atom or a nitrogen atom, D represents a five- to seven-membered hydrocarbon ring, and A1to A4represent a carbon atom or a nitrogen atom, except that B represents a carbon atom and all of A1to A4represent carbon atoms) and salts thereof.本發明之農園藝用殺菌劑含有選自式(I)(式中，R表示CR1R2R3所表示之基或氰基，R1~R3表示氫原子、烷基、羥基等，X1表示鹵化基等，m為0~5中之任一整數，X2表示鹵化基等，n為0~3中之任一整數，B表示碳原子或氮原子，D表示5~7員烴環，A1~A4表示碳原子或氮原子，於B為碳原子之情形時，A1~A4不全為碳原子)所表示之含氮雜環化合物及其鹽中之至少1種作為有效成分。
