A radiographic image detector comprising: a radiation detection element including a plurality of pixels, arrayed in a honeycomb pattern, that each include a sensor portion adapted to generate charges according to irradiated radiation and having a hexagonal shaped pixel region; a detection section, provided for each of the plurality of pixels, each including a pixel electrode adapted to collect the charges, a storage capacitor adapted to accumulate the charges collected by the pixel electrode, and a first switching element and/or a second switching element adapted to read out the charges accumulated in the storage capacitor; a plurality of first scan lines that are disposed one for each of a plurality of pixel rows and that are each connected to control terminals of the first switching elements in the corresponding pixel row; a plurality of second scan lines that are disposed one for each of respective pairs of the plurality of pixel rows that are adjacent to each other in a column direction, and that are each connected to control terminals of the second switching elements in the corresponding column direction adjacent pair of pixel rows; a plurality of data lines (D1-D3) that are disposed so as to respectively intersect with the plurality of first scan lines and the plurality of second scan lines, the plurality of data lines (D1-D3) including, a plurality of first data lines adapted to transmit first charge signals corresponding to a combined charge amount of 3 pixels that are read out by the second switching elements of the 3 pixels (P1, P2, P3) mutually adjacent in the respective pairs of column direction mutually adjacent pixel rows, and a plurality of second data lines adapted to transmit second charge signals corresponding to a combined charge amount of 2 pixels that are read out by the second switching element of the 2 specific pixels (P4, P5) adjacent to the 3 pixels in the pixel row direction, and transmit third charge signals of 1 pixel that is read out by the first switching element of the 1 specific pixel adjacent to the 2 specific pixels in the pixel column direction, the detection section of said 1 specific pixel having only a first switching element; and a plurality of charge amplifiers (CA1-CA3) that are each connected to one end of the plurality of respective data lines (D1-D3), the plurality of charge amplifiers (CA1-CA3) including, a plurality of first charge amplifiers adapted to convert the first charge signals into voltage signals during a first period and a plurality of second charge amplifiers adapted to sum the second charge signals and the third charge signals together and convert the sum into voltage signals during a second period. a radiation detection element including a plurality of pixels, arrayed in a honeycomb pattern, that each include a sensor portion adapted to generate charges according to irradiated radiation and having a hexagonal shaped pixel region; a detection section, provided for each of the plurality of pixels, each including a pixel electrode adapted to collect the charges, a storage capacitor adapted to accumulate the charges collected by the pixel electrode, and a first switching element and/or a second switching element adapted to read out the charges accumulated in the storage capacitor; a plurality of first scan lines that are disposed one for each of a plurality of pixel rows and that are each connected to control terminals of the first switching elements in the corresponding pixel row; a plurality of second scan lines that are disposed one for each of respective pairs of the plurality of pixel rows that are adjacent to each other in a column direction, and that are each connected to control terminals of the second switching elements in the corresponding column direction adjacent pair of pixel rows; a plurality of data lines (D1-D3) that are disposed so as to respectively intersect with the plurality of first scan lines and the plurality of second scan lines, the plurality of data lines (D1-D3) including, a plurality of first data lines adapted to transmit first charge signals corresponding to a combined charge amount of 3 pixels that are read out by the second switching elements of the 3 pixels (P1, P2, P3) mutually adjacent in the respective pairs of column direction mutually adjacent pixel rows, and a plurality of second data lines adapted to transmit second charge signals corresponding to a combined charge amount of 2 pixels that are read out by the second switching element of the 2 specific pixels (P4, P5) adjacent to the 3 pixels in the pixel row direction, and transmit third charge signals of 1 pixel that is read out by the first switching element of the 1 specific pixel adjacent to the 2 specific pixels in the pixel column direction, the detection section of said 1 specific pixel having only a first switching element; and a plurality of charge amplifiers (CA1-CA3) that are each connected to one end of the plurality of respective data lines (D1-D3), the plurality of charge amplifiers (CA1-CA3) including, a plurality of first charge amplifiers adapted to convert the first charge signals into voltage signals during a first period and a plurality of second charge amplifiers adapted to sum the second charge signals and the third charge signals together and convert the sum into voltage signals during a second period.