Patent ID: 6999693

Claim:
A fixing device including a heating roller with a heat source, a press roller that presses the heating roller, a rotation mechanism that rotates the press roller along with the heating roller to fix a developer applied to a to-be-fixed medium fed between the heating roller and the press roller, and a fixation control section that drives the rotation mechanism and the heat source in one of a first mode and a second mode, wherein in a standby time period in which the heating roller and the press roller are heated in a state in which the to-be-fixed medium is not fed, the fixation control section detects the temperature of the press roller and compares the detected temperature with a first reference temperature and a second reference temperature assigned to the first mode and a first reference temperature and a second reference temperature assigned to the second mode, thereby controlling turn-on/off of the rotation mechanism, and the first reference temperature assigned to the first mode is set higher than the first reference temperature assigned to the second mode and the second reference temperature assigned to the first mode is set higher than the second reference temperature assigned to the second mode.