If the moving direction of a suction nozzle during raising and lowering deviates from a vertical direction, appropriate work cannot be guaranteed because the holding position of a component by the suction nozzle will vary depending on the holding height of the component by the suction nozzle. Thus, a component loaded at a specified height (H) position from the upper surface of a stage is held by a suction nozzle, and that component is loaded at a specified position. Then, the component is imaged and the loading position (first height component loading position) of the component is calculated. Further, the component loaded on the stage is held by the suction nozzle and the component is loaded at the above specified position. Then, the component is imaged and the component loading position (second height component loading position) is calculated. Next, the deviation amount between the first height component loading position and the second height component loading position is calculated. Thus, appropriate mounting can be guaranteed by performing correction of the component holding position, correction of the component loading position, or the like, based on the deviation amount.