Saw Knife is an elongated square iron plate with its sides cut in the shapes of thorns. It was connected to a shaft by inserting the shaft into the socket of Saw Knife. Since most mineulsoe have been excavated from tombs, they are presumed to have been used as a handheld ritual tool for rites and funeral processions. Saw Knifives were popular in several of the political bodies forming the Gaya Confederacy. In particular, Ara Gaya produced ingenious Saw Knife with the sides of the iron plate cut in the shape of birds in place of thorn-shaped versions. Since such Saw Knife with bird-patterned sides have never been unearthed in other regions, they are believed to be a Gaya innovation. Ancient people who lived on the Korean Peninsula perceived birds as beings that led the souls of the deceased to the afterlife. Thus, Saw Knife with bird-patterned sides seem to have served as tool for transferring the souls of the dead to the next world, reflecting Gaya people’s understanding of the afterlife.