An image forming apparatus includes an image forming mechanism configured to form a visible image using toner on a recording sheet according to input image data and a fixing mechanism configured to fix the visible image onto the recording sheet. The fixing mechanism includes a first roller, a second roller, a belt, and a third roller. The first roller is configured to rotate. The second roller includes inside a first heater and is configured to rotate. The belt is looped over the first and second rollers. The third roller is arranged opposite to the first roller via the belt, includes inside a second heater, and has a surface resistivity not higher than 1.0.times.10.sup.6 .OMEGA.-cm under a voltage of 10 V. The third roller applies a pressure to the belt and the first roller and rotates in conjunction with a movement of the first roller via the belt.