Fixing apparatus

A fixing apparatus for fixing an image formed on a recording material, said fixing device comprising:

• a guiding member configured to guide movement of the recording material, provided in a recording-material passing opening of said apparatus;
• a rib projecting from a recording material passing surface of said guiding member, configured to be contacted by the recording material;
• a shutter provided at a position opposing said guiding member and movable between a position for opening the recording-material passing opening and a position closing the recording-material passing opening;
• and
• a projection provided at a position of said shutter opposing a portion of said guiding member not having said rib with respect to a direction perpendicular to a recording-material feeding direction, wherein when said shutter takes the closing position, the clearance between said rib and said shutter is larger than the clearance between said guiding member and said projection.