This fixing device has a fixing portion coming into contact with one face of a sheet, a plurality of drive portions coming into contact with the other face of the sheet to nip the sheet with the fixing portion, and a control portion for driving a plurality of the drive portions. The drive portions are placed in a direction orthogonal to a transportation direction of the sheet. The control portion controls driving of the drive portions independently of each other so that a speed difference may be imparted to the transportation speed of the sheet in the direction orthogonal to the transportation direction of the sheet. Thereby, it becomes possible to stabilize passing posture of the sheet S, and therefore to decrease wrinkling and image failure attributed to the passing posture of the sheet.