PROBLEM TO BE SOLVED: To provide a radiation imaging apparatus high in convenience and cost effectiveness for an imaging site where general imaging and long-size imaging coexist.SOLUTION: A radiation imaging apparatus S for acquiring a radiation image by general imaging on the basis of an image signal from one radiation imaging unit D2 of a plurality of radiation imaging units D1-D3, and also acquiring a long-sized radiation image on the basis of an image signal from the plurality of radiation imaging units D1-D3 includes a first support unit 100 for supporting the radiation imaging unit D2, and a second support unit 110 for supporting the other radiation imaging units D1 and D3 except the radiation imaging unit D2 of the plurality of radiation imaging units D1-D3. The second support unit 110 is configured so as to be attached to and detached from the first support unit 100, and is attached to the first support unit 100 in acquiring the long-sized radiation image.SELECTED DRAWING: Figure 1
