To provide an automatic transmission capable of most suitably controlling a target transmission ratio at the time of starting and at the time of normally travelling.

The automatic transmission furnished with the controller 20 to control the target transmission ratio in accordance with a driving state of a vehicle is furnished with a means 21 for detecting a stopping state of the vehicle and a means 31 for detecting starting intention and accelerating intention of a driver, and the controller 20 changes the target transmission ratio in accordance with the detected stopping state of the vehicle and an accelerating intention by providing a plurality of the target transmission ratios at the time of starting the vehicle.