A tetrazolinone compound of formula (1): wherein R 1 and R 2 each independently represents a hydrogen atom, etc.; R 3 represents a C1-C6 alkyl group, etc.; R 4 , R 5 , and R 6 each independently represents a hydrogen atom, etc.; A represents a C6-C16 aryl group optionally having one or more atoms or groups selected from Group P, etc.; Q represents the following group Q1, etc.; and X represents an oxygen atom or a sulfur atom, has excellent control activity against pests.