According to a first aspect of the invention, there is provided a bearing structure including: a resin bush having a flange formed to be brought into contact with a plate face around a bearing hole from one side, a locking edge formed to be locked with the plate face around the bearing hole from the other side, and a circular through-hole formed to bear the support shaft inserted therethrough, wherein, upon receiving a load applied to the support shaft, the entire resin bush is flexibly displaced so that an inner circumferential surface of the through-hole is aligned with a hole edge of the bearing hole and the support shaft is born by the hole edge of the bearing hole.