In the embodiments, the imaging device is used as the information acquisition device of the present invention, but there is no limitation to this, and various information acquisition devices can be used. That is, there is no limitation as long as the information acquisition device emits and/or receives light in order to acquire information from the outside of the vehicle. Various devices can be used such as a sensor for measuring an inter-vehicular distance, a visible light and/or infrared camera for measuring an inter-vehicular distance, a light-receiving apparatus configured to receive signals from the outside of a vehicle, such as an optical beacon, and a camera that is configured to use visible light and/or infrared rays and read white lines and the like on a road in an image. Also, the number of openings in the blocking layer 4 can be changed as appropriate according to the type of information acquisition device. It is possible to emit and/or receive light through a dedicated opening, for example. Note that the information acquisition device may or may not be in contact with the glass plate. In either case, the heating wire is formed in a region of the glass plate through which light from the information acquisition device passes (information acquisition region).
Hereinafter, examples of the present invention will be described. However, the present invention is not limited to the following examples.