To provide an automatic document carrying device whose convenience in use is improved by automatically operating a tray according to an operating condition of a device.

A setting surface 7 is provided to set a document to be carried. A document receiving tray 11 to receive the discharged document is arranged in the vicinity of a document discharge port 10. The lower end of the document receiving tray 11 can rotate, and a tray driving device is connected to the inmost side. The tray driving device rotatably displaces the document receiving tray 11 with the lower end as the center according to an operating condition of an automatic document carrying device 1. The document receiving tray 11 is almost vertically stood (A and D) until the document is set on the setting surface 7. When the document is carried, the document receiving tray 11 is rotated (B and C) in an obliquely lying condition to receive a paper sheet discharged from the discharge port 10. Therefore, when the document is set on the setting surface 7, the document receiving tray does not become a hindrance. Since the document receiving tray 11 is automatically driven, convenience in use is improved.