To detect an error caused by the pull-out of paper in an early stage.

A paper conveying device includes: a manual insertion sensor 21 detecting paper 3; resist rollers 14A and 14B arranged on a downstream side from the manual insertion sensor 21 in a paper 3 conveying direction, and conveying the paper 3; and a resist rear sensor 22 arranged on a downstream side from the resist rollers 14A and 14B in the paper 3 conveying direction, and detecting the paper 3. The error is detected when a state that the manual insertion sensor 21 and the resist rear sensor 22 detect the paper 3 is changed to a state that the resist rear sensor 22 does not detect the paper 3 in a state that the manual insertion sensor 21 detects the paper 3.