Fixing device and image forming apparatus

A fixing device comprising:

• a fixing belt;
• a heating roller and a fixing roller over which the fixing belt is looped;
• a pressure roller forming a fixing nip with the fixing belt;
• a pair of side plates, one of the side plates being disposed on each end of a shaft of the fixing roller and each end of a shaft of the heating roller;
• and
• two pairs of heating roller holding members configured to hold corresponding insulating bushing, the insulating bushing being attached to the corresponding ends of the shaft of the heating roller, and corresponding heating roller bearings, the heating roller bearings being attached to the corresponding ends of the shaft of the heating roller, the two pairs of the heating roller holding members being attached to opening parts of the side plates, wherein
• the heating roller holding members are formed of two separate components such that the heating roller is capable of moving along the opening parts formed in the side plates toward the fixing roller.