It is possible to improve convenience for a user. A radiation imaging system includes radiation detectors which have an imaging surface, on which radiation is incident, and generate a radiation image of an imaging target according to radiation transmitted through the imaging region as an imaging target of an object and incident on the imaging surface, a grid for normal imaging which has an effective area narrower than the imaging surface and eliminates scattered radiation included in radiation transmitted through the imaging target and incident on the effective area, and a moving unit which functions as a holding unit capable of holding the grid for normal imaging at a plurality of positions along the imaging surface where the imaging surface and the effective area overlap each other.
