Body and electromagnetic wave sensor

A structure body comprising:

• an electromagnetic wave detector;
• and
• a pair of arms that are positioned on both sides with the electromagnetic wave detector interposed therebetween,
• wherein the electromagnetic wave detector includes a temperature detection element and an electromagnetic wave absorber which covers at least a part of the temperature detection element,
• wherein the structure body has a structure in which the electromagnetic wave detector is hung or suspended with respect to a substrate facing the electromagnetic wave detector via the pair of arms,
• wherein area of a surface of the pair of arms on a side facing the substrate is larger than area of a surface thereof on a side opposite to the side facing the substrate,
• wherein the arms have a linear shape, and
• wherein a width of each of the arms gradually narrows from an end of each of the arms on the side facing the substrate to an end of each of the arms on the side opposite to the side facing the substrate.