Image heating apparatus

An image heating apparatus comprising:

• a heater, an image on a moving recording material being heated by a heat from said heater, said heater including an elongated substrate extending in a direction perpendicular to a shifting direction of the recording material, and a first heat generating body and a second heat generating body for generating heat by energization and provided on said substrate along a longitudinal direction thereof, said first and second heat generating bodies being disposed side by side in a direction perpendicular to the longitudinal direction of said substrate, and said first heat generating body having a first heat generating portion, and a second heat generating portion provided at a longitudinal end of said first heat generating portion and having a heat generating amount per unit length smaller than that of said first heat generating portion;
• and
• a detecting member for detecting a width of the recording material, wherein when the width of the recording material is detected to be smaller than a predetermined width by said detecting member, said first heat generating body is energized, and, when the width of the recording material is detected to be greater than the predetermined width, said second heat generating body is energized, and said detecting member is provided at a position corresponding to said second heat generating portion in the longitudinal direction of said substrate.