Infrared detection device

An infrared detection device comprising a detection element,

• the detection element including:
• a semiconductor substrate provided with a cavity on a surface of the semiconductor substrate;
• a signal interconnect section provided in a region surrounding the cavity of the semiconductor substrate;
• a detection cell spaced from the semiconductor substrate above the cavity, including:
• a thermoelectric conversion layer;
• and
• an absorption layer laminated with the thermoelectric conversion layer, and provided with a plurality of holes penetrating the absorption layer to reach the cavity, a side surface of each of the holes being inclined to the surface of the semiconductor substrate, a first width of an upper surface portion of the absorption layer between two of the holes being wider than a second width of a lower surface portion of the absorption layer between the two of the holes, the first width and the second width being along a direction parallel to the surface of the semiconductor substrate;
• and
• a support section to hold the detection cell above the cavity and to connect the signal interconnect section and the detection cell.