There is a harmful organism that cannot be controlled or is difficult to be controlled with the use of a single agent of a compound represented by the general formula (1) according to the invention, an insecticide, a miticide or a bactericide. Accordingly, an object of the invention is to provide a composition for preventing harmful organisms for efficiently controlling such a harmful organism. That is, the invention is directed to a composition for preventing harmful organisms, characterized by comprising the compound represented by the general formula (1) and other insecticides, miticides or bactericides as active ingredients, wherein, in the formula, A 1 , A 2 , A 3 and A 4 independently represent a carbon atom, a nitrogen atom or an oxidized nitrogen atom G 1 and G 2 independently represent an oxygen atom or a sulfur atom R 1 and R 2 independently represent a hydrogen atom or a C 1 to C 4 alkyl group Xs may be the same or different and represent a hydrogen atom, a halogen atom or a trifluoromethyl group Q 1 represents a substituent such as a phenyl group or a heterocyclic group and Q 2 represents a substituent such as a phenyl group or a heterocyclic group.)
