A tetrazolinone compound of formula (1):wherein R1 and R2 each independently represents a hydrogen atom, etc.；R3 represents a C1-C6 alkyl group, etc.； R4, R5, and R6 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.； andX represents an oxygen atom or a sulfur atom, has excellent control activity against pests.
