To provide a game machine equipped with a multilayer bubble generating gimmick capable of generating the flow of air bubbles full of changes.

A display screen 4 of a center gimmick arranged on a board surface of the game machine is covered with a multilayer bubble generating gimmick 5. The multilayer bubble generating gimmick 5 comprises a front side bubble generating gimmick 5B and a rear side bubble generating gimmick 5A, and they are piled up in a direction vertical to the board surface. The generation of the air bubbles 30A and 30B inside the liquid containers 11A and 11B of the respective bubble generating gimmicks and the flow of the generated air bubbles do not interfere with each other. When the air bubbles are formed in different forms in the bubble generating gimmicks 5A and 5B, the flow of the different air bubbles is superimposed in the view from the front of the board surface, and the performance effect of the board surface of the game machine is increased by a deep three-dimensional air bubble flow.