A detector comprises a plurality of photoelectric converters to output an electrical signal corresponding to an incident light, and a plurality of filter circuits provided corresponding to each of the plurality of photoelectric converters or to each of a plurality of element groups respectively including a predetermined number of the photoelectric converters of the plurality of photoelectric converters, the plurality of filter circuits attenuating a signal having a predetermined frequency from the electrical signal output from the plurality of photoelectric converters,In the above-described detector, the plurality of photoelectric converters may be provided in a first substrate, and the plurality of filter circuits may be provided in a second substrate laminated on the first substrate.