PURPOSE: To provide an infrared detector low in cost and excellent in detecting sensitivity.

CONSTITUTION: An infrared detector 10 has a bridge type structure having an air gap 3 between substrates 1, a plurality of infrared ray detecting unit elements 11 each formed of a laminate of an upper electrode 7, a thin film element 6 including a pyroelectric effect and a lower electrode 5 and arranged close to each other on the substrate 1 in such a manner that the electrodes 7, 5 of the element 11 are connected in parallel. With the structure, the detector 10 which its productivity is improved, a cost is reduced, and an infrared condensing area is large, with the fact that an excellent detecting sensitivity can be provided.