Vehicle, route calculation device, and route calculation method

A route calculation method including a target route calculation step where a route calculation device calculates a target route from a current position of a vehicle to a destination of the vehicle that is set through a destination setting device, the method comprising:

• a detection step where a peripheral environment detection unit detects a peripheral travel environment of the vehicle and a roundabout that exists in the target route;
• a determination step where the route calculation device determines whether, at a target exit of the roundabout that exists in the target route, a travel restricting event that restricts passing of the vehicle through the target exit has occurred on a basis of the peripheral travel environment;
• and
• an addition step where the route calculation device adds a circulation in the roundabout to the target route in a case where it is determined that the travel restricting event has occurred.