PURPOSE: To provide an automatic check-in device which can perform check-in operation in a simple way and can facilitate the management of airline tickets by converting plural ordinary airline tickets into a single automatic check-in airline ticket.

CONSTITUTION: An automatic check-in device is provide is provided with an input device 40 which inputs the information on the sheet number of airline tickets, the seat reservation information, etc., an area CCD 42 which reads the information on the flight numbers, the flight dates, etc., out of the airline tickets, a liquid crystal display device 51 which instructs to input the seat reservation information after the CCD 42 read the information, and a CPU 31 which performs the control to record and eject the seat numbers, the gate numbers, etc., when the CCD 42 reads the information on an automatic check-in airline ticket and then the seat reservation information is inputted, to record the information on each airline ticket on another ticket form when the ticket sheet number information and the seat reservation information are inputted and the CCD 42 reads the information on the ordinary airline tickets in a number equal to the number of inputted airline tickets, and to eject the automatic check-in airline ticket after recording additionally the seat number, the gate number, etc.