Automatic transmission

An automatic transmission coupled to an engine laterally disposed in a vehicle, comprising;

• a plurality of gear sets, each of which includes a sun gear, a ring gear, a carrier to rotatably support a pinion which engages with the sun gear and the ring gear on a pinion shaft;
• a lubricating-oil supply passage to supply lubricating oil to a bearing portion between the pinion and the pinion shaft;
• a transmission case including a case body having an opening positioned on an opposite side to the engine and an end cover fixed to the case body to close the opening, one of said planetary gear sets, which has the pinion to rotate at a highest speed, is disposed closest to the end cover of the transmission case and configured such that an inner peripheral face of the carrier thereof is rotatably supported on an outer peripheral face of a boss portion provided at the end cover to extend in an axial direction toward the inside of the case body, said lubricating-oil supply passage includes a boss-portion-inner oil passage formed from the end cover to the boss portion, a carrier-inner oil passage formed in the carrier to tightly connect to the boss-portion-inner oil passage at the inner face of the carrier, and a shaft-inner oil passage formed in the pinion shaft to tightly connect to the carrier-inner oil passage and reach an outer peripheral face of the pinion shaft;
• and a lubricating oil supply to supply lubricating oil to the bearing portion between the pinion and the pinion shaft via said lubricating-oil supply passage.