A sheet conveying device having conveyer rollers for conveying sheets one by one, a jam treater having a space and sheet guides for regulating a front side and a back side of a conveyed sheet. In the space of the jam treater, a sheet is guided, and the jam treater is rotatable and can be drawn out of a housing of the sheet conveying device. The sheet guides have curved portions to form a space in which the jam treater rotates. In order to remove a jammed sheet from a sheet path in the sheet conveying device, an operator rotates the jam treater to wind the jammed sheet around the jam treater and draws the jam treater together with the jammed sheet out of the housing.