Heating device, fixing device, and image forming apparatus

A heating device comprising:

• a rotating body;
• a heating body configured to rotate together with the rotating body, and heat a material to be heated while sandwiching and transporting the material to be heated between the heating body and the rotating body;
• and
• a contact mechanism configured to switch the rotating body between a first contact state and a second contact state in a non-existence state where the material to be heated does not exist between the rotating body and the heating body after the material to be heated passes between the rotating body and the heating body,
• wherein the first contact state is a state where the rotating body is in contact with the heating body at a central portion of the rotating body and one end portion of the rotating body in a rotation axis direction of the rotating body, the heating body being configured to heat the rotating body while rotating together with the rotating body, so that an area of the rotating body in contact with the heating body at an other end portion of the rotating body in the rotation axis direction is smaller than an area of the rotating body in contact with the heating body at the central portion of the rotating body in the rotation axis direction, and
• wherein the second contact state is a state where the rotating body is in contact with the heating body at the central portion of the rotating body and the other end portion of the rotating body in the rotation axis direction, so that an area of the rotating body in contact with the heating body at the one end portion of the rotating body in the rotation axis direction is smaller than the area of the rotating body in contact with the heating body at the central portion of the rotating body in the rotation axis direction.