The present invention provides a nitrile compound represented by the formula (I): wherein R represents C1-C4 fluoroalkyl, Q represents halogen, C1-C11 alkyl optionally substituted with halogen, C2-C6 alkenyl group optionally substituted with halogen, C2-C6 alkynyl optionally substituted with halogen, C3-C7 cycloalkyl optionally substituted with halogen or (C3-C7 cycloalkyl optionally substituted with halogen) C1-C4 alkyl, which has excellent control effect against pests. ##STR00001##