A compound of formula (I), or an N-oxide thereof is provided. In the compound of formula (I), Het1 represents Het1-1, Het1-2, Het1-3, Het1-4, Het1-5, Het1-6, Het1-7, Het1-8, or Het1-9, and the remaining variable groups are as defined in the specification. The compound of formula (I), or N-oxide thereof has a superior effect in controlling arthropod pests.