To provide a technology for improving the alignment of sheets at the discharge of the sheet while making the device smaller.

The sheet transfer device of transferring a sheet comprise a device body having a transfer path for transferring the sheet, and a transfer means of transferring the sheet along the transfer path. The transfer path has a route inclined from a sheet introduction port which is formed at the upper end of the device body toward the lower end of the device, and reaches a sheet discharge port opened in the upward direction of the device body while being bent at the lower end of the device body. Between the sheet discharge port and the device body, there are formed a sheet-end receiving face for receiving the end of sheet discharged from the sheet discharge port perpendicularly from below, and an inclined face inclined from the peripheral edge of the opening of the sheet discharge port toward the sheet receiving face.