Image forming appartus having temperature sensing element for sensing temperature of recording material

A temperature sensing part of temperature sensing means (104,105) is arranged to come into contact with the surface opposite to the image surface of a recording material (111) at the time of one-sided printing without providing such an opposed member that comes into contact with the image surface of the recording material (111) at least in a position corresponding to the position of the temperature sensing part (104,105) that is in contact with the recording material (111).