The present invention addresses the problem of providing a method and the like for producing a euryphagous sericin silkworm strain that can also be raised throughout the entire larval stage thereof on low -cost artificial feed containing almost no mulberry leaf. Provided is a method of producing a euryphagous sericin silkworm strain that includes crossbreeding a euryphagous silkworm strain with a sericin silkworm strain having a mutation in a gene related to a synthesis pathway for fibroin and crossbreeding the obtained hybrid specimen at least twice with a euryphagous silkworm strain , then performing breeding within the resulting strain at least five times on the basis of the traits of the sericin silkworm strain and the traits of the euryphagous silkworm strain.
