Control device for vehicle and control method for vehicle

A control method for a vehicle,

• the vehicle including an automatic transmission and an electronic control unit, the automatic transmission including a plurality of frictional engagement elements and being configured to establish one shift stage of a plurality of shift stages by selectively engaging the plurality of frictional engagement elements with each other,
• the control method comprising:
• performing, by the electronic control unit, gear shift control corresponding to a degree of progress in gear shift based on a target gear shift characteristic value;
• and
• when the electronic control unit determines that an input torque of the automatic transmission at a gear shift start time becomes equal to or less than a first predetermined torque during a gear shift of the automatic transmission, updating, by the electronic control unit, the target gear shift characteristic value to a first target value and performing, by the electronic control unit, the gear shift control from the degree of progress in gear shift at a first updating time based on the first target value,
• the target gear shift characteristic value being a value corresponding to the input torque, the first predetermined torque being an input torque that is less by a predetermined torque than the input torque at the gear shift start time, the first target value being a value of the target gear shift characteristic value that is set when the gear shift starts with the first predetermined torque, and the first updating time is a time at which the target gear shift characteristic value is updated to the first target value.