To provide a harmful arthropod control composition having excellent control efficacy against a harmful arthropod.

The harmful arthropod control composition includes spinetoram, one kind or more of compounds selected from the group (A), and one kind or more of compounds selected from the group (B), and exhibits the excellent control efficacy against the harmful arthropod. The group (A) is the group comprising silafluofen, clothianidin and nitempyram. The group (B) is the group comprising tricyclazole, fthalide, ferimzone, diclocymet, validamycin A, furametpyr and azoxystrobin.