An automatic operation vehicle that automatically performs an operation in an operation area, the vehicle comprising: a behavior acquisition means configured to acquire behavior information including a distance of a movement of the automatic operation vehicle and a moving direction; an image analysis means configured to extract a marker included in an image captured by a camera provided on the automatic operation vehicle; and a survey means configured to acquire, by triangulation, position information of the marker extracted by the image analysis means, wherein the survey means acquires the position information of the marker using a first angle that is an angle difference between a constant moving direction and a direction to the marker from a first point through which the automatic operation vehicle passes during the movement in the constant moving direction, a second angle that is an angle difference between the constant moving direction and a direction to the marker from a second point through which the automatic operation vehicle passes during the movement in the constant moving direction, and the distance between the first point and the second point, the second point being different from the first point, and characterized in that the automatic operation vehicle further comprises a moving direction determining unit configured to determine the constant moving direction when the survey means starts acquiring the position information of the marker such that the operation vehicle does not come into contact with the marker and an angle difference of the constant moving direction with respect to the direction from the current position of the automatic operation vehicle to the marker is smaller than 45°, the survey means is configured to determine the first point and the second point during the movement of the automatic operation vehicle in the constant moving direction such that the angle difference between the first angle and the second angle becomes close to 90°, and the survey means is configured to determine, during the movement of the automatic operation vehicle in the constant moving direction, the first point such that the first angle becomes close to 45°, and to determine the second point such that the second angle becomes close to 135°. a behavior acquisition means configured to acquire behavior information including a distance of a movement of the automatic operation vehicle and a moving direction; an image analysis means configured to extract a marker included in an image captured by a camera provided on the automatic operation vehicle; and a survey means configured to acquire, by triangulation, position information of the marker extracted by the image analysis means, wherein the survey means acquires the position information of the marker using a first angle that is an angle difference between a constant moving direction and a direction to the marker from a first point through which the automatic operation vehicle passes during the movement in the constant moving direction, a second angle that is an angle difference between the constant moving direction and a direction to the marker from a second point through which the automatic operation vehicle passes during the movement in the constant moving direction, and the distance between the first point and the second point, the second point being different from the first point, and characterized in that the automatic operation vehicle further comprises a moving direction determining unit configured to determine the constant moving direction when the survey means starts acquiring the position information of the marker such that the operation vehicle does not come into contact with the marker and an angle difference of the constant moving direction with respect to the direction from the current position of the automatic operation vehicle to the marker is smaller than 45°, the survey means is configured to determine the first point and the second point during the movement of the automatic operation vehicle in the constant moving direction such that the angle difference between the first angle and the second angle becomes close to 90°, and the survey means is configured to determine, during the movement of the automatic operation vehicle in the constant moving direction, the first point such that the first angle becomes close to 45°, and to determine the second point such that the second angle becomes close to 135°.