PURPOSE: To add a winning entrance mechanism to a side part indication device installed on the side part of the playing area of a relatively narrow playing board.

CONSTITUTION: Several light sources 29... are installed on the installation base board 28 which forms a storage room for the light sources, and the front opening of the storage room is shut by the 1st front board 32. And in the front side of this 1st front board 32, the 2nd front board 33 is separately attached. Thus, a space for balls to go down is formed between the 1st and the 2nd boards 32 and 33. And by locating the 2nd ball receiving projected part 38 inside this space, the 2nd winning entrance 35 which has a sensor 40 inside is formed there.