The objective of the invention is to provide a plant activator with superior resistance-inducing activity and low toxicity and soil contamination. A plant activator comprising, as an active ingredient, an oxo fatty acid derivative of general formula (I): HOOC-(R<；sup>；1<；/sup>；)-C=C-C(=O)-R<；sup>；2<；/sup>； (I)(wherein, R<；sup>；1<；/sup>；is a straight or branched alkyl group with 6 to 12 carbon atoms, and optionally comprises one or more double bonds, R<；sup>；2<；/sup>；is an alkyl group with 2 to 8 carbon atoms, and optionally comprises one or more branches and/or double bonds) or a salt or an ester thereof.
