A tetrazolinone compound represented by formula (1): wherein R 1 represents a C1-C6 alkyl group; R 2 , R 3 , and R 4 are the same or different and represent a hydrogen atom; R 5 represents a C1-C3 alkyl group optionally having one or more halogen atoms; Y represents #-C(R A1 R A2 )-Z- in which left end and Q are bound to each other, and R A1 and R A2 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.