Fixing device and image forming apparatus including thermistor and thermostat aligned in a sheet conveyance direction

A fixing device which fixes a toner image formed on a sheet to the sheet, the fixing device comprising:

• a fixing belt;
• a pressure member configured to pressibly make contact with the fixing belt and rotate around an axis of rotation;
• and
• a heating section which faces an inner peripheral surface of the fixing belt, wherein the heating section includes:
• a heater which heats the fixing belt;
• a heater holding member which holds the heater;
• a plurality of first heat sensitive bodies arranged on the heater holding member;
• and
• a plurality of second heat sensitive bodies arranged on the heater holding member, the second heat sensitive bodies differing from the first heat sensitive bodies in whether or not to restore supply of electricity after shutting of the supply of electricity to the heater,
• the heater has:
• a first heater portion which is one end portion of a pair of end portions of the heater in a longitudinal direction thereof;
• a second heater portion which is another end portion of the pair of end portions of the heater;
• and
• a third heater portion which is a portion of the heater positioned between the first heater portion and the second heater portion,
• the first heat sensitive bodies include two first heat sensitive bodies,
• the second heat sensitive bodies include three second heat sensitive bodies,
• one of the two first heat sensitive bodies and one of the three second heat sensitive bodies face the first heater portion and are aligned in a conveyance direction of the sheet,
• another one of the two first heat sensitive bodies and another one of the three second heat sensitive bodies face the third heater portion and are aligned in a direction in which the axis of rotation extends,
• yet another one of the three second heat sensitive bodies faces the second heater portion,
• the first heat sensitive bodies include an additional first sensitive body in addition to the two first heat sensitive bodies, and
• the additional first heat sensitive body and the yet another one of the second heat sensitive bodies face the second heater portion and are aligned in the conveyance direction of the sheet.