To effectively utilize a space in the flat surface direction of a head by, after sucking each part of adjoining parts, so that the sides adjoining each other are almost parallel through moving the head, for attaching the part to a printed substrate.

A vacuum channel is formed for each sucking nozzle 41, and a switching valve is provided for each vacuum channel. Therefore, independent of the vertical movement of the nozzle 41, the vacuum channel is formed for each sucking nozzle 41, while a part 5 is sucked. Thus, a straight line passing through the position which is both a rotation center of a nozzle holder and the center of four nozzles 41 from the nozzle 41 is sucked at a position 45° with respect to one side of the electronic part 5, and a corner part of each part 5 of four sucking nozzles 41 is aligned with the center position, with the sides of the adjoining parts 5 being parallel to each other, and the space of an attaching head is utilized effectively, for sucking an electronic part 5. At that time, the corner parts are not made exactly conformity each other, and the interval from the adjoining part 5 may be larger to some extent.