Settsu Shiki was situated in the capital and originally served to manage Naniwa no Tsu (Naniwa Port) as well as conduct inspections of envoys traveling between the capital and the west of the country, but later went on to conduct the administration of Naniwa which was made a baito (secondary capital city) during the Reign of Emperor Tenmu and Naniwanomiya Palace which was constructed during the reign of Emperor Shomu
摂津職は、京に置かれ難波津を管理し、京と西国の間を上下する公使の検査などを本来の任務としたが、天武朝に難波が陪都（副都）とされ、また聖武朝にも難波宮が造営されると、その管理にも当たった。