Provided is a structural body, formed in a plate-like shape and positioned with respect to an assembly jig including a positioning pin and supporting a first surface of the structural body, including a positioning hole formed through an end portion, a positioning protrusion being inserted into the positioning hole; and a pair of first position detection areas formed on a second surface of the end portion through which the positioning hole is formed. The positioning hole is formed apart from an axis line connecting the pair of first position detection areas.