Fixing device including casing, harness, and harness holder holding harness in cooperation with casing

A fixing device comprising:

• a casing;
• a heating portion extending in a first direction and configured to apply heat to a sheet;
• a pressure portion configured to form a nipping region between the pressure portion and the heating portion;
• a connector detachably attached to the heating portion;
• a harness connected to the connector for supplying electric power to the heating portion through the connector;
• and
• a harness holder fixed to the casing, the harness holder being positioned upstream relative to the connector in an attachment direction of the connector to the heating portion, the attachment direction crossing the first direction, the harness holder holding the harness between the harness holder and the casing, the harness holder being configured to restrict movement of the connector by making contact with the connector in a case where the connector moves upstream in the attachment direction,
• wherein the harness holder has a first end portion and a second end portion opposite the first end portion, and a connecting portion connecting the first end portion and the second end portion to each other,
• wherein the connecting portion is positioned away from the casing, and
• wherein the harness has a portion positioned between the connecting portion and the casing in the first direction.