Image forming apparatus capable of stably detecting temperature of fixing device regardless of orientation of the image forming apparatus

An image forming apparatus that is orientatable in either a first position or a second position, the second position being different from the first position in inclination with respect to a horizontal plane, comprising:

• a fixing device that includes a heating roller and a pressurizing member, presses the pressurizing member against a surface of the heating roller to form a fixing nip, and thermally fixes a toner image formed on a recording sheet passing through the fixing nip;
• at least one temperature detector that detects temperature of the surface of the heating roller without contact with the surface;
• a heater that heats the heating roller;
• a controller that controls the heater according to the temperature detected by the at least one temperature detector, and thereby controls the temperature of the surface of the heating roller;
• and
• a switcher that switches a detection point of the at least one temperature detector between a first detection point and a second detection point according to whether the image forming apparatus is in the first position or in the second position;
• wherein the switcher serves as a movement mechanism that moves the at least one temperature detector according to whether the image forming apparatus is in the first position or in the second position.