Thereupon, in 1604 the Edo Shogunate established itowappu system by having selected merchants from Kyoo, Sakai, and Nagasaki form itowappu nakama (guild of raw silk threads importers); in forming the itowappu nakama, the Edo Shogunate made Shirojiro CHAYA, the government contractor, the leader.
そこで幕府は1604年（慶長9年）、御用商人茶屋四郎次郎を主導者として京都・堺市・長崎の特定商人に糸割符仲間をつくらせた。