Tomobe originated from Tomonomiyatsuko before the ritsuryo legal code system, and like Kudaratebito, most of them supervised especially the industrial branches at the work-site operations leading Shinabe and Zakko.
令制以前の伴造の系統にあり､百済手部のようにほとんどは品部・雑戸を率いて現業特に工業部門を指揮した。