Image forming apparatus

An image forming apparatus comprising:

• a fixing device including a fixing roller, a pressure roller pressed into contact with said fixing roller, and temperature detection means in contact with a non-paper-passage region on a surface of said fixing roller,
• said fixing roller incorporating first heating means whose heat distribution based on an axial direction of said fixing roller is set such that heat in a middle region thereof is higher than heat in opposite-end regions thereof, and second heating means whose heat distribution based on the axial direction of said fixing roller is set such that heat in opposite-end regions thereof is higher than heat in a middle region thereof;
• and
• a controller for controlling power supply to said first heating means and said second heating means, and wherein
• said controller starts power supply to said first heating means and said second heating means to start warm-up of said fixing device, and cuts off power supply to said first heating means for a predetermined period of time during said warm-up.