A radiation detection element comprising: a plurality of polygonal pixels (20, 40) that are arrayed in a form of a honeycomb formed of a plurality of either hexagonal or rhomboid or rectangular pixels included in first (20a, 20c) and second pixel rows (20b, 20d), wherein the first pixel rows and the second pixel rows are arrayed alternately in one direction, and that have charge generating/accumulating portions that generate and accumulate charges due to irradiation being irradiated, and switching elements that are connected to the charge generating/accumulating portions and that are for reading-out charges accumulated at the charge generating/accumulating portions; a plurality of scan lines that are disposed in parallel in a first direction, and to which switching signals, that control switching of the switching elements, are outputted; and a plurality of data lines that are disposed in parallel in a second direction that intersects the first direction, and to which the charges, that have been read-out by the switching elements, are outputted, wherein, per pixel row that is demarcated by two scan lines, the charge generating/accumulating portions and the switching elements are disposed alternately at one side or another side of the respective data lines to which they are connected, and the plurality of switching elements respectively are disposed so as to be, in the first direction, connected to the data lines from alternately different sides of the data line corresponding thereto, wherein the data lines are disposed so as to be bent along some of peripheral edges of the polygonal pixels, and the switching elements are disposed on the scan lines, characterized in that the plurality of switching elements is disposed such that a channel width direction between source electrodes and drain electrodes of the switching elements is the first direction. a plurality of polygonal pixels (20, 40) that are arrayed in a form of a honeycomb formed of a plurality of either hexagonal or rhomboid or rectangular pixels included in first (20a, 20c) and second pixel rows (20b, 20d), wherein the first pixel rows and the second pixel rows are arrayed alternately in one direction, and that have charge generating/accumulating portions that generate and accumulate charges due to irradiation being irradiated, and switching elements that are connected to the charge generating/accumulating portions and that are for reading-out charges accumulated at the charge generating/accumulating portions; a plurality of scan lines that are disposed in parallel in a first direction, and to which switching signals, that control switching of the switching elements, are outputted; and a plurality of data lines that are disposed in parallel in a second direction that intersects the first direction, and to which the charges, that have been read-out by the switching elements, are outputted, wherein, per pixel row that is demarcated by two scan lines, the charge generating/accumulating portions and the switching elements are disposed alternately at one side or another side of the respective data lines to which they are connected, and the plurality of switching elements respectively are disposed so as to be, in the first direction, connected to the data lines from alternately different sides of the data line corresponding thereto, wherein the data lines are disposed so as to be bent along some of peripheral edges of the polygonal pixels, and the switching elements are disposed on the scan lines, characterized in that the plurality of switching elements is disposed such that a channel width direction between source electrodes and drain electrodes of the switching elements is the first direction.