A feeder installing attachment includes: a main body portion including attachment side fitting parts provided on a lower surface thereof and having an installing compatibility with first feeder side fitting parts provided on a lower surface of a first tape feeder; and second feeder installing slots formed on an upper surface of the main body portion and engaging with second feeder side fitting parts provided on a lower surface of a second tape feeder having a standard width smaller than that of the first tape feeder. In a state where the attachment is mounted, an array pitch of the second feeder installing slots is smaller than an array pitch of the base side installing slots, and becomes an array pitch corresponding to the standard width of the second tape feeder.