Organic sulfur compound and its use for controlling harmful arthropod

An organic sulfur compound represented by the formula (I):

• wherein,
• R1 represents a C1-C5 haloalkyl group having at least one fluorine atom,
• R2 represents a C1-C4 alkyl group optionally substituted with at least one halogen atom, a C1-C4 alkoxy group optionally substituted with at least one halogen atom, or a C1-C4 alkylthio group optionally substituted with at least one halogen atom,
• R3 represents a hydrogen atom, a halogen atom or a C1-C4 alkyl group,
• R4 represents a cyano group, C(=Q)OR7 or C(=Q)N(R8)2,
• R5 represents a hydrogen atom, a halogen atom or a C1-C4 alkyl group,
• R6 represents a C1-C5 fluoroalkyl group,
• Q represents an oxygen atom or a sulfur atom,
• R7 represents a C1-C4 alkyl group,
• R8's each independently represent a hydrogen atom or a C1-C4 alkyl group, or two R8's are bonded to each other at their terminals to form a C2-C7 alkylene group,
• m represents an integer of 1 to 4, and
• n represents 0, 1 or 2.