Sheet stacker with aligning/conveying rollers and image forming apparatus using the same

The present invention relates to a sheet finishing apparatus by which image formed sheets delivered from an image forming apparatus main body are ejected by a sheet delivery means and are placed on a sheet delivery tray, and to an image forming apparatus. A sheet finishing apparatus is provided with a sheet passage; a conveyor to covey a sheet along the sheet passage; an intermediate stacker on which the sheet conveyed along the sheet passage is placed so that a bundle of sheets is formed on the intermediate stacker; a finisher to conduct a finishing process for the bundle of sheets formed on the intermediate stacker; a sheet delivering section to which the bundle of sheets is delivered; and a sheet delivering device to true up edges of the bundle of sheets on the intermediate stacker before the finisher conducts the finishing process and to deliver the bundle of sheets from the intermediate stacker to the sheet delivering section after the finisher has conducted the finishing process.