Film heater

A film heater comprising:

• a transparent conductive portion including:
• at least one non-conductive portion that has electrical insulation properties and extends in a direction intersecting a vibration direction of an electric field included in a radio wave transmitted from a radio wave transmitter-receiver;
• and
• a heat generator that generates heat by being energized and that transmits light;
• a first electrode connected to the heat generator;
• and
• a second electrode connected to the heat generator, wherein
• the heat generator includes at least one conductive portion that is adjacent to the non-conductive portion and generates heat by a current flowing along a direction in which the non-conductive portion extends when the heat generator is energized by the first electrode and the second electrode, and
• the first electrode is disposed outside the heat generator with respect to the second electrode and surrounds the second electrode, the film heater further comprising:
• an inter-electrode non-conductive portion having electrical insulation properties and disposed between the first electrode and the second electrode.