A radiation imaging apparatus includes conversion elements which convert a radial ray into an electric signal, a signal line which reads electric signals obtained by the conversion elements, switch elements which are connected between the conversion elements and the signal line, and driving lines connected to control terminals of the switch elements. The first conversion element and the signal line are in a conductive state when a switch element connected to the first driving line is in an On state. The second conversion element and the signal line are in a conductive state when a switch element connected to the second driving line is in an On state. The third conversion element and the signal line are in a conductive state when a switch element connected to the first driving line and a switch element connected to the second driving line are in an On state.