Fixing device and image forming apparatus

A fixing device for fixing a toner image formed on a recording material on the recording material, the fixing device comprising:

• a heating unit including a rotatable member which is cylindrical and flexible and a heating member in contact with an inner peripheral surface of the rotatable member;
• a pressing roller including a core metal and a rubber layer covering the core metal and configured to contact an outer peripheral surface of the rotatable member, the pressing roller forming a nip portion with the rotatable member by sandwiching the rotatable member with the heating member;
• and
• a metallic frame configured to hold the pressing roller, the frame including an inlet portion provided with an opening through which the recording material is conveyed to the nip portion and an outlet portion provided with an opening through which the recording material is conveyed from the nip portion to an outside,
• wherein in a region other than the inlet portion and the outlet portion, the frame is provided with an opening portion of which a length in a rotational axis direction of the pressing roller is longer than a length of the rubber layer in the rotational axis direction.