PURPOSE: To prevent the flowing of grinding pellets, dirts, and the like into a feeding pipe of pachinko balls by extending an air curtain in a selection device of pachinko balls and grinding pellets, which is connected to the upper end opening of a lifting tube.

CONSTITUTION: At the upper end opening 6 of a lifting tube 2, a selection device 7 to select pachinko balls B and grinding pellets P is provided. At the upper position of the selection device 7, an air nozzle 33 is arranged, and by an air curtain formed by the air blown out downward from the jet 34 of the air nozzle 33, grinding pellets P, dirts, and the like are prevented from flowing in to a feeding pipe 15 of pachinko balls, which links to the selection device 7. As a result, the grinding pellets, dirts, and the like are prevented from flowing in to the feeding pipe of pachinko balls effectively.