A tetrazolinone compound represented by formula (1): wherein Q represents a divalent 5-membered aromatic heterocyclic group optionally having one or more atoms or groups selected from Group P2; A represents a 5- to 10-membered monocyclic or fused ring heterocyclic group optionally having one or more atoms or groups selected from Group P1; R1 and R2 each represents a hydrogen atom, etc.; R3 represents a C1-C6 alkyl group optionally having one or more halogen atoms, etc.; R4, R5, and R6 each represents a hydrogen atom, etc.; and X represents an oxygen atom or a sulfur atom, has excellent control activity against pests.