Image forming device

An image forming device comprising:

• an image former including an image carrier, the image former forming a toner image on the image carrier;
• an intermediate transfer belt onto which the toner image on the image carrier is intermediately transferred, the intermediate transfer belt being stretched over a plurality of rollers;
• an intermediate transfer roller whose position can be manually switched between a first position at which a surface of the intermediate transfer belt is brought into contact with the image carrier and a second position at which the intermediate transfer belt is separated from the image carrier, the intermediate transfer roller being one of the plurality of rollers;
• an image density sensor being a sensor that detects the toner image on the intermediate transfer belt, a position of the image density sensor relative to the intermediate transfer belt varying depending on whether the intermediate transfer roller is located at the first position or at the second position;
• and
• a controller that determines whether the intermediate transfer roller is located at the first position or at the second position based on a detection value of the image density sensor.