To efficiently perform a cream solder printing and part mounting operation by versatilely applying a single wiring board holding device to wiring boards of various layouts for stable support without using a specified backup jig only for such wiring board as one equipped with the same part layout.

There are provided a pin raising/lowering means 24 which utilizes a fluid pressure, backup pins 23 which are supported by the pin raising/ lowering means for vertical movement while individually moved vertically within a prescribed stroke range by the fluid pressure, and lock mechanisms 25 and 26 which fix the rising position when the backup pins reach prescribed rising positions, respectively.