Fixing device and image forming apparatus

A fixing device comprising:

• a first rotating body heated by a heat source;
• a press unit including a second rotating body, a belt around an outer circumferential surface of the second rotating body, and a supporting frame configured to support the second rotating body, the supporting frame is capable of turning around a turning fulcrum, the turning fulcrum is parallel to the first rotating body, the supporting frame contains a pressurizing arm extending toward the forward direction of the first rotating body;
• an urging member configured to urge the pressurizing arm in a direction in which the second rotating body approaches the first rotating body;
• a stopper section including a screw shaft section and a base body section, the screw shaft section configured to form a screw on the outer circumferential surface, the base body section configured to form along an axial of the screw shaft;
• a fixed frame including a screw hole in which the screw shaft section of the stopper section is fit, an end of the stopper section of a direction along the axial projects from the fixed frame toward the pressurizing arm;
• and
• a rotation regulating section configured to press an outer surface of the base body section orthogonal direction to the axial direction.