In a sensor substrate, a plurality of pixels are formed in a pixel region of a first surface of a flexible base material, and a terminal portion for electrically connecting a cable is provided in the terminal region of the first surface. A conversion layer is provided outside the terminal region of the base material and converts radiation into light. A reinforcing member is provided on a second surface of the base material to reinforce the strength of the base material. A stress neutral plane adjusting member is provided inside the terminal region and in at least a part, corresponding to the inside of the terminal region, of a cable electrically connected to the terminal portion.