To prevent calculation errors and fraudulent acts and reduce cost by automatic monitoring, a wirelessly communicating game monitoring system includes an identifying information recording device, attached to playing cards or the like, for recording identifying information of the card; an identifying information reading device for reading wirelessly the information recorded in the identifying information recording device; a control device for performing various kinds of calculations or determinations required in the process of games using the identifying information read with the identifying information reading devices; and a display divce for displaying the results of the calculation or determination made with the control divce. The system also includes stake money handling devices for players to operate and enter stake money amounts, an output divce for outputting summed results after the end of games, and a recording divce for recording identifying information and calculation results. The game monitoring system is built into a game playing table on which playing cards are dealt to play games.