A mounting head 16 includes shaft members 23 respectively provided with suction nozzles 22, rotation driving motors 24 for individually conducting rotary movements of the shaft members 23, and vertical movement driving motors 25 which are arranged in a staggered arrangement in an opposite direction to a staggered arrangement of the shaft members 23, and adapted to individually conduct vertical movements of the shaft members 23. The rotation driving motors 24 directly drive the shaft members 23, and the vertical movement driving motors 25 move the shaft members 23 up and down, together with the rotation driving motors 24.