This invention provides an insecticidal and miticidal agent which contains as an effective ingredient an oxazoline derivative represented by the formula <CHEM> wherein, R<1> represents a fluorine atom, a chlorine atom, a C1 to C3 alkyl group or a C1 to C3 alkoxy group, and R<2> represents a fluorine atom or a chlorine atom. The insecticidal and miticidal agent exhibits an excellent insecticidal and miticidal activity against harmful insects and mites parasitic on useful plants.
