A control device of a transfer device has: a mark relative position calculation unit which calculates a relative position of the three compensation marks relative to the cart, based on a captured image of the camera; a posture calculation unit which calculates a posture of the robot arm which arranges the article at the delivery position, based on a relative position of the three compensation marks calculated by the mark relative position calculation unit, and a teaching positional relationship which is taught in advance as a positional relationship between the three compensation marks and the delivery position; a reference positional relationship determination unit which determines whether a mutual positional relationship between the three compensation marks matches with a reference positional relationship set in advance, based on the relative positions of the three compensation marks calculated by the mark relative position calculation unit; and a displacement notification unit which notifies to outside of a possibility of displacement of the three compensation marks, in a case of the reference positional relationship determination unit determining that the mutual positional relationship of the three compensation marks does not match with the reference positional relationship.