A thermal infrared detector includes a substrate; a temperature sensor having electrical characteristics changed in accordance with changes in temperature caused by infrared absorption; heat-insulating supporting legs supporting and thermally insulating the temperature sensor and serving as signal lines for reading out electrical signals from the temperature sensor; and an infrared absorption layer in thermal contact the temperature sensor. Each of the temperature sensor, the heat-insulating supporting legs, and the infrared absorption layer is in a different plane and the planes are spatially separated from each other.
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