To provide a game parlor management system that effectively identifies a suspected player while excluding a player who plays fair to have a predetermined income and outgo or more.

The management device 5, for example, manages the number of abnormal conditions detected when the income and outgo exceeds reference income and outgo in which the income and outgo is set in advance, or when an initial investment does not exceeds a reference investment amount in which the initial investment is set in advance, as the number of detected abnormal conditions, and identifies a player whose number of detected abnormal conditions exceeds the reference value, as a suspicious player. The management device identifies only a player whose cumulative total value is beyond the allowable range of the game parlor as a suspicious player without identifying a player whose cumulative total value falls within the allowable range of the game parlor as a suspicious player, even if the cumulative total value of game information of the player is high.