PURPOSE: An automatic transmission is provided to reduce a manufacturing time and a manufacturing cost by including a hub for connecting a brake disk and a clutch disk at the same time. CONSTITUTION: A first clutch connects operation components. A second clutch connects operation components. A first brake connects the operation components to a case. A hub(50) connects a first clutch disk of the first clutch, a second clutch disk of the second clutch disk, and a brake disk of the brake. The hub includes a first fixing part and a second fixing part. The first fixing part(52) connects the first clutch disk. The second fixing part(54) connects the second clutch disk to the brake disk.
