Abstract: A transport vehicle includes a vehicle body, a drive unit, and a coupling device coupling the vehicle body with the drive unit. The drive unit includes a wheel, a travel drive source configured to drive the wheel in such a manner as to rotate the wheel, and a steering device configured to turn the wheel around a steering axis along an up-down direction. The coupling device includes an attachment section attached to the vehicle body, and an adjustment mechanism allowing a reference direction to be changed around the steering axis relative to a front-rear direction of the vehicle body by changing an attachment orientation of the attachment section relative to the vehicle body.

Abstract: An automated guided vehicle has a coupler configured to be coupled to a body of a carriage in such a manner that the coupler is restricted from rotating about an up-down axis relative to the body, and the automated guided vehicle drives a drive wheel with a drive source to move the carriage, while the coupler is coupled to the body at a position outward of a supporter in a width direction, the supporter being configured to support an object to be transported.

Abstract: A control unit is configured to performs a first control of controlling a movement unit so that a fitted part of a screw member and a fitting part of a rotating body are axially aligned with each other; a second control of controlling the movement unit to press the fitting part against the fitted part; a third control of, while maintaining a state in which the fitting part is pressed against the fitted part, controlling a rotation-driving unit to rotate the rotating body to a first rotation direction side by a first predetermined angle; a fourth control of, while maintaining the state in which the fitting part is pressed against the fitted part, controlling the rotation-driving unit to rotate the rotating body to a second rotation direction side by a second predetermined angle, which is smaller than the first predetermined angle, the fourth control performed after the third control.