(57) The invention provides an image detector capable of improving the quality of detected images by reducing electronic noise, the image detector comprising, a plurality of scan lines (101) disposed in parallel, a plurality of data lines (3) provided so as to cross with the scan lines, thin film transistors (4) connected with the scan and data lines and provided in matrix, sensor sections (103) connected to the thin film transistor and provided in a matrix and a plurality of common lines disposed so as to apply bias voltage commonly to the sensor sections provided in matrix. Each of the scan lines, data lines and common lines are formed by metal layers different from each other and provided with insulating film(s) disposed therebetween.
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