A novel guanidine compound having excellent fungicidal activities is represented by formula [I] (in the formula, Y represents a divalent group represented by the following formula [II] (wherein R7 to R9 each independently represents a hydrogen atom or the like) or the like, X and Z each independently represents an unsubstituted or substituted alkylene group or the like, Q1 and Q2 each independently represents a single bond or the like, A1 and A2 each independently represents an unsubstituted or substituted divalent heterocyclic residue or the like, and R1 to R6 each independently represents a hydrogen atom or the like.一種具有優異之殺菌活性之新穎之胍化合物,係以式[I]表示(式中,Y表示下述式[II](式中R7~R9分別獨立地表示氫原子等)等表示之二價基,X及Z分別獨立地表示未經取代或具有取代基之伸烷基(alkylene group)等,Q1及Q2分別獨立地表示單鍵等,A1及A2分別獨立地表示未經取代或具有取代基之二價之雜環式化合物殘基等,R1~R6分別獨立地表示氫原子等。)。