To prevent generation of elongation sound of paper after oblique advancement of the paper is corrected.

The medium conveying device is provided with a lower resist roller 6 for conveying the paper P in a downstream direction of a medium conveying route R on the medium conveying route R; a first drive motor 66 for feeding drive force to the lower resist roller 6; and a resist roller gear unit 86 interposed between the first drive motor 66 and the lower resist roller 6 and feeding the drive force fed from the first drive motor 66 to the lower resist roller 6. The resist roller gear unit 86 is provided with an input gear 86a input with drive force from the first drive motor 66; an output gear 86b to output the drive force input from the input gear 86a to a first paper feed roller 4; and a spring 86c arranged between the input gear 86a and the output gear 86b.