Transmission device for vehicle

A transmission device for a vehicle disposed within the vehicle and configured to operate a transmission for transmitting the output of the engine of the vehicle to driving wheels, comprising:

• a first rotating unit configured to be rotatably coupled to a first rotating axis;
• a second rotating unit configured to be rotatably coupled to a second rotating axis separated from the first rotating axis;
• a joint unit configured to connect the first rotating unit and the second rotating unit to allow the first rotating unit and the second rotating unit to rotate relative to each other;
• a shift mode selection unit configured to be mounted on at least one of the first rotating unit, the second rotating unit, and the joint unit;
• and
• a driving unit configured to rotate the second rotating unit about the second rotating axis in response to receiving an operating signal to change an angle between the first rotating unit and the second rotating unit with respect to the joint unit.