To provide a support structure of a rotating shaft capable of reducing a load or impact to be borne by a bearing for rotatably supporting a shaft even in the case where a support structure is used for such an application that the bearing bears, during rotation of shaft is stopped, the load or impact heavier than that during rotation.

This support structure of the rotating shaft is provided with a fixing part 12 arranged to at least one side edge face 10A of a shaft 10 (30) or to a flange face 41A provided on the shaft 10 (30) via a clearance C, and is formed such that the clearance C becomes shorter than the distance that the shaft 10 (30) is displaced when an excessive axial load is applied thereon.