Infrared sensor

An infrared sensor comprising:

• an electrical insulating film sheet;
• first and second temperature sensor devices which are provided on one side of the electrical insulating film sheet, said sensor devices being located at a distance from each other;
• a pair of contact electrodes, with which the first and second temperature sensor devices are in contact respectively, said contact electrodes being formed on the one side of the electrical insulating film sheet;
• an infrared absorbing film which is provided on the other side of the electrical insulating film sheet, and is positioned opposite the first temperature sensor device across the electrical insulating film sheet;
• and
• an infrared reflector film which is provided on the other side of the electrical insulating film sheet, and is positioned opposite the second temperature sensor device across the electrical insulating film sheet;
• wherein the first and second temperature sensor devices respectively comprise:
• a thermistor element;
• and
• a pair of electrode layers, one of which is in contact with the contact electrode, said electrode layers being formed both on upper and lower surfaces of the thermistor element.