Other instruments developed by Michio MIYAGI are tangoto (short stringed instrument), which was developed for education and promotion purpose, and super-large hachijugen (80-stringed instrument), which was produced on a trial basis.
宮城道雄が開発した楽器はほかにも教育用普及楽器の短箏（たんごと）、試験的に作られた超大型楽器八十絃がある。