To keep expectation of a player to the variation of patterns, to reduce monotonousness of a game and to improve amusement.

This pachinko game machine is provided with a display device 12 for displaying the plurality of patterns; a special pattern starting port switch 10d for detecting a game situation; a pattern variation carrying-out means 40 for allowing the display device 12 to vary and display the patterns when a game ball enter a special pattern starting port; a pattern variation stopping means 42 for stopping the variation of the patterns at a stopping pattern according to the game situation; a pattern information storing means 46 for storing the pattern information about the stopping pattern; and a special game state generation means 47 for generating a special game state advantageous for the player (a probability varying state e.g.) based on a plurality of pieces of pattern information.