There is provided an organic sulfur compound having an excellent controlling effect on harmful arthropods represented by the formula (I): wherein, R1 represents a C3-C10 alkenyl group optionally substituted with at least one halogen atom, a C3-C10 alkynyl group optionally substituted with at least one halogen atom, or the like, R2 represents a cyano group or the like, R3 represents a hydrogen atom, a halogen atom or a C1-C4 alkyl group, R4 represents a C1-C5 fluoroalkyl group, and n represents 0, 1 or 2.
