HEATING UNIT

A heating unit includes a heater, an endless belt, a holder, a heat conductive sheet, and a connector including a connecting terminal connected to a supply terminal. The connector is configured to hold a first end of the heater in the longitudinal direction and a first end of the holder in the longitudinal direction. The holder includes a first surface supporting the heat conductive member, and a second surface supporting the first end of the heater. The second surface is located at a position nearer to the heater than the first surface in a direction orthogonal to the substrate. A height of a step formed between the first surface and the second surface is greater than a thickness of the heat conductive member.