A two-dimensional image detector includes a sensitive semiconductor layer for converting optical information or radiological information corresponding to a two-dimensional image of a detection subject into electrical charge information; an active matrix substrate for retrieving the electrical charge information converted on the sensitive semiconductor layer; an amplifying electric circuit portion for amplifying the electrical charge information retrieved on the active matrix substrate and converting the electrical charge information into an electrical signal for an image; a disturbance-causing member attached to one side of the amplifying electric circuit portion which may cause a disturbance in the electrical signal. A first disturbance blocking buffer is disposed between the disturbance-causing member and the amplifying electric circuit portion for blocking the disturbance.