PURPOSE: To clarify sales by managing the information of the number of lending of a game medium by a dual system and to sufficiently manage a game shop by providing the subject managing device with a lending number integrating meter and a lending number measuring part interlocking with it and outputting the number of lending of the game medium by the measured value of the lending number measuring part to an output means.

CONSTITUTION: The game medium lending number managing device to manage the information of the number of lending of the game medium delivered from a game medium lending machine arranged between game machines is provided with the lending number integrating meter 30, etc., to integrate the number of lending of the game medium at every game medium lending machine. Also, a detection value equivalent to the integrated number of lending of the game medium is outputted from a lending number detecting part 60. Moreover, when the game medium is delivered, the information of the number of lending of the game medium based on the detection value of the lending number detecting part 60 is recorded on a storage part 70. A readout signal is transmitted from a control part 80 so as to output the information of delivery time of the game medium from the output means 90.