A transmission configured with a speed change control unit which, when upshifting the speed in an accelerator on condition, executes an engagement control including a torque phase control after executing a filling control, which controls the hydraulic control unit in such a way that a hydraulic servo of the engagement side frictional engagement element is filled with hydraulic oil, and a standby control, which controls the hydraulic control unit in such a way that hydraulic pressure for the hydraulic servo is maintained at a preset standby pressure. A correction unit is configured to correct at least one of an execution time of the filling control and the standby pressure to an increment side when a fluctuation in a rotational acceleration of the input shaft exceeding a preset determination reference is detected after the standby control.