Fixing device provided with insulator and restriction member supporting the same

An image forming apparatus comprising:

• a main frame;
• and
• a fixing device attached to the main frame, the fixing device comprising:
• a rotary body having a hollow cylindrical shape and a rotational axis extending in a first direction;
• a heater positioned inside the rotary body and having a tubular shape, the heater extending in the first direction and having one end and another end;
• a first power supply cord having one end portion connected to the one end of the heater;
• a first insulator configured to hold both the one end of the heater and the one end portion of the first power supply cord, the first insulator having a plurality of outer peripheral surfaces including one surface through which the one end of the heater is inserted;
• a second power supply cord having one end portion connected to the another end of the heater;
• a second insulator configured to hold both the another end of the heater and the one end portion of the second power supply cord, the second insulator having a plurality of outer peripheral surfaces including:
• a first surface through which the another end of the heater is inserted;
• and
• a second surface positioned opposite to the first surface with respect to a connecting portion between the another end of the heater and the second power supply cord;
• a support frame including:
• a first support portion supporting the first insulator, the first support portion being configured to support the plurality of outer peripheral surfaces of the first insulator except the one surface;
• and
• a second support portion supporting the second insulator, the second support portion being configured to support the plurality of outer peripheral surfaces of the second insulator except both the first surface and the second surface;
• and
• a restriction member having one side wall positioned between the rotary body and the one surface of the first insulator, the restriction member being configured to be detachably attached to the support frame and to restrict movement of the first insulator in the first direction, the one side wall having at least a portion overlapped with the one surface as viewed in the first direction.