To provide a control device for an automatic transmission, measuring an input torque equivalent value using a fixed gear peculiar to a provided transmission mechanism, precisely controlling a starting clutch based on the input torque equivalent value, and generating a desired output for starting, and starting smoothly.

A strain gauge 24 and a torque value calculating means 16 detect a torque value that acts a sun gear based on reaction force, an input equivalent value calculating means 42 calculates an input equivalent value based on the detected torque value, and a hydraulic pressure control means 17 controls output from a starting clutch 4 by controlling operation of a hydraulic servo based on the input torque equivalent value calculated by the input equivalent value calculating means. Thus, by measuring the input torque equivalent value via the sun gear peculiar to the automatic speed change mechanism 5 and then regarding the input torque equivalent value as a target input torque, a hydraulic pressure for FB control is appropriately fed, and the start clutch is precisely controlled.