An infrared sensor device includes an infrared sensor element in which a membrane is formed on a surface side of a substrate by forming a concave portion on a rear face side of the substrate, and electrodes for detection are arranged on the surface side of the substrate, and an infrared ray absorbing film for absorbing the energy of an infrared ray by receiving the infrared ray is arranged at the membrane on the rear face side of said substrate. The substrate is electrically connected to a circuit substrate through a bump in a state in which the surface side of the substrate is opposed to the circuit substrate.