A radiation imaging apparatus includes a radiation generation unit configured to radiate radiation to an object, a radiation detection unit configured to detect the radiation having passed through the object, an irradiation size detection unit configured to detect a size of an irradiation range of the radiation radiated by the radiation generation unit, a movement detection unit configured to detect a relative movement of the radiation generation unit and the radiation detection unit with respect to the object, and a control unit configured to control irradiation of the radiation to the object performed by the radiation generation unit. The control unit resumes, after a stop of the irradiation of the radiation, the irradiation of the radiation to the object performed by the radiation generation unit according to the relative movement detected by the movement detection unit and the size of the irradiation range detected by the irradiation size detection unit.
