A tetrazolinone compound represented by formula (1): wherein R 1 and R 2 are the same or different and represent a hydrogen atom, etc. R 3 represents a C1-C6 alkyl group, etc. R 4 , R 5 , and R 6 are the same or different and represent a hydrogen atom, etc. A represents a C6-C10 aryl group optionally having one or more atoms or groups selected from Group P 1 , etc. Q represents the following group Q1 and X represents an oxygen atom, has excellent control activity against pests.