PROBLEM TO BE SOLVED: To provide a novel amidine compound having excellent bactericidal activity and a bactericidal agent or a plant disease control agent containing the same as an active ingredient.SOLUTION: There is provided a compound represented by the formula [I] or a salt hereof. [I], where Aand Aare each independently an unsubstituted/substituted bivalent aromatic hydrocarbon compound residue or Ais an unsubstituted/substituted bivalent heterocyclic compound residue, however Ais not pyridine ring, X and Z are each independently an unsubstituted/substituted alkylene group or the like, Qand Qare each independently a single bond, an unsubstituted/substituted phenylene group or the like, Rto Rare each independently H, an unsubstituted/substituted hydrocarbon group and Y is a cyclic amine residue or the like.SELECTED DRAWING: None【課題】優れた殺菌活性を有する新規なアミジン化合物、ならびにこれを有効成分として含有する殺菌剤または植物病害防除剤の提供。【解決手段】式〔I〕で表される化合物またはその塩。（Ａ1及Ａ２は夫々独立に無置換／置換の二価の芳香族炭化水素化合物残基又はＡ2は無置換／置換の二価の複素環式化合物残基（但し、Ａ１はピリジン環ではない）；Ｘ及びＺは夫々独立に無置換／置換のアルキレン基等；Ｑ1及びＱ2は夫々独立に単結合、無置換／置換のフェニレン基等；Ｒ1～Ｒ6は夫々独立にＨ、無置換／置換の炭化水素基；Ｙは環状アミン残基等）【選択図】なし
