A fixing device and an image forming apparatus to pass a paper through a nip portion between a fixing roller and a pressure roller and fix a toner image on the paper. The image forming apparatus includes a first spring and a second spring to press the pressure roller against the fixing roller and an operation lever to change a pressing state of the springs. The operation lever has two positions of: a first position in which pressing of the pressure roller by the first spring is made active and pressing by the second spring is made inactive; and a second position in which the pressing by the second spring is made active and the pressing by the first spring is made inactive. A contact pressure of the pressure roller against the fixing roller is differentiated in the first position and in the second position.