Photosensitive device

A photosensitive device comprising N first integrating circuits arranged in correspondence with a one- or two-dimensional array of N (N≧2) photosensitive elements, a first detection circuit for selecting and detecting a specific signal from N signal voltages output from said N first integrating circuits, an A/D conversion circuit for converting the signal voltages output from said N first integrating circuits into digital signals on the basis of the signal detected by said first detection circuit, and outputting the digital signals, N second integrating circuits arranged in correspondence with the N photosensitive elements, switches and capacitors inserted in turn between N sets of second integrating circuits and first integrating circuits, a second detection circuit for selecting and detecting a specific signal from signal voltages output from said N second integrating circuits, and a timing control circuit for controlling operation timings of said first and second integrating circuits on the basis of the signal detected by said second detection circuit.