A plant disease controlling composition, containing a carboxamide compound represented by formula (I):wherein R1 represents a hydrogen atom or a methyl group and R2 represents a methyl group, a difluoromethyl group or a trifluoromethyl group and a pyridazine compound represented by formula (II)wherein A1 represents a chlorine atom, a bromine atom, a cyano group or a methyl group, and A2 represents a hydrogen atom or a fluorine atom.
