To provide a control apparatus for appropriately performing long-length photography by using a radiation imaging apparatus and a radiation imaging system capable of appropriately performing long-length photography.SOLUTION: A control apparatus 54, C includes a plurality of radiation imaging apparatuses 1 and a radiation irradiation apparatus 52 for irradiating the plurality of radiation imaging apparatuses 1 with radiation, and is used for controlling a radiation imaging system 50 capable of performing long-length photography for generating a plurality of radiation images with one-time radiation irradiation. The control apparatus is capable of receiving an interlock release signal that the radiation imaging apparatus 1 transmits when it is brought into a state that it can perform photography, from each of the plurality of radiation imaging apparatuses 1, and is configured so as to give radiation irradiation permission to the radiation irradiation apparatus 52 when the interlock release signal from all the radiation imaging apparatuses 1 is received.SELECTED DRAWING: Figure 8
