A radiographic image detector comprising: a detection section including a plurality of pixels having hexagonal shaped pixel regions arrayed in a honeycomb pattern, each pixel including, a sensor portion that generates charges according to irradiated radiation, a first switching element that reads out the generated charges, and a second switching element that reads out the generated charges; a plurality of first scan lines, disposed one for each of a plurality of pixel rows configured by a plurality of the pixels adjacent to each other along a row direction, that are connected to a control terminal of the first switching element in each of the pixels of the corresponding pixel row; a plurality of second scan lines, disposed one for each of the plurality of pixel rows, that are split into a plurality of line-groups and are connected to control terminals of the second switching elements of the pixel groups belonging to each respective group such that, when combining and reading charges from a plurality of pixel groups each configured from a plurality of adjacent pixels in the plurality of pixel rows, charge signals corresponding to combined charge amounts read out from the respective plurality of pixel groups are transmitted through different respective data lines; and a plurality of data lines, disposed so as to respectively intersect with the plurality of first scan lines and the plurality of second scan lines, that transmit first charge signals corresponding to charges read out by the first switching elements in each of the plurality of pixels, and that transmit second charge signals corresponding to the combined charge amounts read by the second switching elements of the respective plurality of pixel groups, characterized in that combinations of the pixels configuring respective pixel groups are determined such that, when a plurality of hexagonal shaped regions are formed adjacent to each other, the plurality of hexagonal shape regions results in a honeycomb pattern array, wherein each of the hexagonal shape regions is formed by including inside one center of gravity of the region surrounded by an outline of the plurality of pixel groups configured by the respective 3 pixels or the respective 4 pixels, and by connecting together 6 individual centers of gravity, each of which belongs to a respective pixel group of said outline present at the periphery of the one center of gravity. a detection section including a plurality of pixels having hexagonal shaped pixel regions arrayed in a honeycomb pattern, each pixel including, a sensor portion that generates charges according to irradiated radiation, a first switching element that reads out the generated charges, and a second switching element that reads out the generated charges; a plurality of first scan lines, disposed one for each of a plurality of pixel rows configured by a plurality of the pixels adjacent to each other along a row direction, that are connected to a control terminal of the first switching element in each of the pixels of the corresponding pixel row; a plurality of second scan lines, disposed one for each of the plurality of pixel rows, that are split into a plurality of line-groups and are connected to control terminals of the second switching elements of the pixel groups belonging to each respective group such that, when combining and reading charges from a plurality of pixel groups each configured from a plurality of adjacent pixels in the plurality of pixel rows, charge signals corresponding to combined charge amounts read out from the respective plurality of pixel groups are transmitted through different respective data lines; and a plurality of data lines, disposed so as to respectively intersect with the plurality of first scan lines and the plurality of second scan lines, that transmit first charge signals corresponding to charges read out by the first switching elements in each of the plurality of pixels, and that transmit second charge signals corresponding to the combined charge amounts read by the second switching elements of the respective plurality of pixel groups, characterized in that combinations of the pixels configuring respective pixel groups are determined such that, when a plurality of hexagonal shaped regions are formed adjacent to each other, the plurality of hexagonal shape regions results in a honeycomb pattern array, wherein each of the hexagonal shape regions is formed by including inside one center of gravity of the region surrounded by an outline of the plurality of pixel groups configured by the respective 3 pixels or the respective 4 pixels, and by connecting together 6 individual centers of gravity, each of which belongs to a respective pixel group of said outline present at the periphery of the one center of gravity.