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.
