Automatic transmission

An automatic transmission, comprising:

• a transmission case having a vertical wall part;
• a clutch disposed on a first side of the vertical wall part in an axial direction of the transmission case;
• a given component disposed on a second side of the vertical wall part in the axial direction;
• a sleeve having a cylindrical body extending in the axial direction to the first side and to the second side of the vertical wall part, at a location radially inward of the vertical wall part, and a flange part extending radially outward from the cylindrical body and coupled to the vertical wall part from the second side in the axial direction, the flange part being disposed radially inward of the given component;
• and
• an oil supply passage through which hydraulic fluid is supplied to the clutch,
• wherein the hydraulic fluid is supplied to the clutch from radially inward of the clutch through the vertical wall part,
• wherein the oil supply passage is configured to supply the hydraulic fluid from the vertical wall part to the radially inward of the clutch through a first oil passage extending in the axial direction via a coupling part between the vertical wall part and the flange part, a second oil passage inside the flange part, connected to the first oil passage and extending in the radial direction, and a third oil passage inside the cylindrical body, connected to the second oil passage and extending in the axial direction, and
• wherein a position of the flange part in the axial direction is configured to overlap with a position of the given component in the axial direction.