Vehicle door opening and closing device

A vehicle door opening and closing device to be applied to a vehicle including a vehicle body having a door opening and a door that opens and closes the door opening, the vehicle door opening and closing device comprising:

• a link arm with a proximal portion to be rotatably connected to the vehicle body and a distal portion to be rotatably connected to the door;
• and
• a door drive unit that provides the link arm with a torque for rotating the link arm relative to the vehicle body, wherein
• the door drive unit includes:
• a drive drum to be driven by an electric motor;
• a driven drum to be disposed at a distance from the drive drum;
• a cable that is wound onto the drive drum and the driven drum and transmits power from the drive drum to the driven drum;
• and
• a transmission unit that provides the link arm with the torque, based on power transmitted from the driven drum.