Heat generating device

The present invention provides a heat generating device capable of heating a heat generating portion with a simple configuration and uniformizing the temperature of a windshield in front of the imageforming device. The heat generating device heats the glass surface of the vehicle included in the imaging range of the imaging device outside the imaging vehicle, and includes a main body portion having a fixing portion fixed to the glass surface and an opening opening to the imaging direction of the imaging device. And a planar heat generating portion having a first region and a second region, uniformly generating heat in the plane, and the bottom portion of the opening portion is formed such that the distance from the glass surface gradually becomes closer as the image capturing device is moved away from the photographing direction The first region of the heat generating portion is disposed at the bottom of the opening, and the second region of the heat generating portion is disposed ata fixing portion near the