Fixing device and image forming apparatus

A fixing device comprising:

• a fixing member that is rotatable and heats a surface of a recording medium on which an unfixed image is carried;
• a pressing member that is rotatable and makes pressure-contact with the fixing member to form a nip portion therebetween;
• a heat source that heats the fixing member;
• a temperature detecting unit that detects a temperature of the fixing member;
• and
• a temperature control unit that controls turning-on/off of the heat source in accordance with a predetermined duty for a predetermined control cycle in a turning-on/off cycle, based on temperature information input from the temperature detecting unit, wherein
• the temperature control unit is configured to, during execution of a continuous image-forming job for continuously forming images on a plurality of recording media, set the control cycle and a space between the recording media to be conveyed to the nip in such a manner that a number of turn-ons of the heat source is the same for all the recording media.