A tetrazolinone compound represented by formula (1): wherein R1 represents a C1-C6 alkyl group; R2, R3, and R4 are the same or different and represent a hydrogen atom; R5 represents a C1-C3 alkyl group optionally having one or more halogen atoms; Y represents #—C(RA 1 RA 2)—Z— in which left end and Q are bound to each other, and RA 1 and RA 2 each represents a hydrogen atom; Q represents a divalent C3-C10 carbocyclic group; X represents an oxygen atom; and A represents a C6-C10 aryl group, has excellent control activity against pests.