[Problem] The present invention provides an alkylphenylsulphide derivative having excellent pest control effect or a salt thereof, a pest control agent containing the same as an active component and a production intermediate thereof. [Solution] An alkylphenylsulphide derivative represented by general formula [I]: [In the formula, R1 represents a C1-C6 haloalkyl group or the like, R2 represents a halogen atom, a C1-C6 alkyl group or the like, R3 represents a hydrogen atom, a halogen atom or the like, and R4 represents a C1-C12 alkyl group or the like.] or an agriculturally acceptable salt thereof, a pest control agent containing the same as an active component, and a production intermediate thereof.
