To provide a compound having excellent control effectiveness against harmful arthropods.

The heterocyclic compound is represented by formula (I) [wherein Het is a five-membered aromatic heterocyclic group containing two or more hetero atoms as ring-constituting atoms selected from the group consisting of an oxygen atom, a sulfur atom and a nitrogen atom {the five-membered aromatic heterocyclic group may be substituted}; R1 is a 1-4C alkyl group which may be substituted with a halogen atom, or the like; R2 and R3 are each the same or different and a hydrogen atom or the like; A is a 1-3C alkylene group; L is a single bond or the like; and Cy is a 3- to 11-membered cyclic group which may be substituted].