To improve work efficiency without flawing a printed circuit board.

A presser plate 34 and a cylinder 35 are provided, and the presser plate 34 is disposed above a base plate 2. In the case of detaching the printed circuit board 9 with a positioning pin 4 inserted, from the positioning pin 4, the presser plate 34 is moved to energize the printed circuit board 9 prior to lifting a push-up plate 6, and in this state, the push-up plate 6 is lifted to detach the printed circuit board 9 from the positioning pin 4. The presser plate 34 is then spaced from the printed circuit board 9.