PURPOSE: To easily prevent the influence of a noise from receiving by a simple member even in the inside of an island with extremely small space and narrow gap.

CONSTITUTION: This device is a noise prevention device for a pachinko (Japanese pinball game) machine arranged in the inside of the island 20 constituted by arranging a large number of pachinko machines back to back in a pachinko game shop. A flexible shield sheet 1 formed by adhering insulating films 2, 4 on both surfaces of a metallic film 3 is arranged in a state suspended from the back surface of each pachinko machine arranged back to back, and a part of the shield sheet 1 is connected to the ground.