Provided is a radiation imaging apparatus including a moving member configured to move along a ceiling; a first arm supported by the moving member to rotate with respect to a first rotation axis, wherein the first arm supports a first radiation source and a first radiation detector which are facing each other; a second arm configured to rotate with respect to a second rotation axis crossing the first rotation axis, wherein the second ram supports a second radiation source and a second radiation detector which are facing each other; and a supporting arm supported by the moving member, wherein the supporting arm supports the second arm such that the second arm may be rotatable with respect to the second rotation axis.