PURPOSE: To increase the playing interest by pivoting movable blades in the center opening of a receptacle tray, and depressing these blades with a pachinko ball to cause rolling and dropping to generate the interest beyond alternative choices.

CONSTITUTION: Ball drop parts 13A, 14A at the rear side of a left and a right movable blade 13, 14 are depressed, and on its oversurface a pachinko ball X7 drops into a guide gutter 34 to be guided, and new such an award chance is given that prize balls only for one run are discharged or that no more than two opening/shutting blade pieces of a safe ball receptacle are opened. Thereby either of the ball drop parts 12A-14A of three swinging blades 12-14 arranged in the center opening 11 of a receptacle tray D is depressed by pachinko ball X4, to generate a large difference in discharging prize balls, which should increase the playing interest.