Abstract: A game machine with an automatic judging function according to the present invention is used to play a game in which a winner is determined according to predetermined rules of the game by moving pieces having their own characters across a game board, e.g., a checkerboard. The game machine includes classified pieces whose characters cannot be known by an opponent, a checkerboard with sensors for detecting the rank characters of the pieces disposed thereon, and a judging unit for automatically determining the winning piece on the basis of the rank characters of the pieces when they encounter on the game board. Accordingly, a game player can enjoy a game by inferring the rank characters and future moves of opponent's pieces.