A game machine includes: an entertainment button that can move up and down from a normal operation position to a protruding position; a display part that displays characters related to a content of a game; a character determining part configured to determine a character to be displayed on the display; a stopper plate that holds the entertainment button in the protruding position; and a protruding position detecting part that detects the entertainment button being held in the protruding position by the stopper plate. When the protruding position detecting part detects the entertainment button not being held in the protruding position after having detected the entertainment button being held in the protruding position, the character detecting part recognizes that the entertainment button held in the protruding position is pushed down, and therefore determines a predetermined character. When the character determining part determines the character, the display part displays the determined character.