As an effective means of controlling Aphanomyce cochlioides, to provide a method of highly accurately selecting an Aphanomyce cochlioides-resistant plant variety by using a molecular biological method without depending on the phenotype. To efficiently grow the resultant Aphanomyce cochlioides-resistant plant variety. A method of selecting an Aphanomyce cochlioides-resistant plant variety based on the AFLP method with the use of primers for selecting an Aphanomyce cochlioides-resistant plant variety which strongly link with the locus of an allele having the dominant phenotype of the resistance against Aphanomyce cochlioides.