A transmission device comprising: an encoding unit configured to perform LDPC coding on the basis of a parity check matrix of an LDPC code with a code length N of 17280 bits and a code rate r of 13/16, wherein an LDPC code word of the LDPC code includes K information bits and M=N-K parity bits, the parity check matrix includes an MxK information matrix portion corresponding to the information bits and an MxM parity matrix portion corresponding to the parity bits, the parity matrix portion is a lower bidiagonal matrix in which elements of "1" are arranged in a step-like manner, the row weight of the parity matrix portion being 1 in the first row and 2 in all the remaining rows, the column weight being 1 in the last column and 2 in all the remaining columns, the information matrix portion is represented by a parity check matrix initial value table, and the parity check matrix initial value table is a table showing in its i-th row, 1≤i≤39, the positions of elements "1" in the 1+360x(i-1)-th column of the information matrix portion, and wherein based on each 1+360x(i-1)-th column, 1≤i≤39, columns 2+360x(i-1) through 360xi of the information matrix portion are determined by cyclically shifting downward the respective preceding column by M/360, and is given by 225 274 898 916 1020 1055 1075 1179 1185 1343 1376 1569 1828 1972 2852 2957 3183 548 602 628 928 1077 1474 1557 1598 1935 1981 2110 2472 2543 2594 2721 2884 2981 59 69 518 900 1158 1325 1367 1480 1744 2069 2119 2406 2757 2883 2914 2966 3232 1330 1369 1712 2133 2206 2487 2596 2606 2612 2666 2726 2733 2754 2811 2948 3030 391 542 689 748 810 1716 1927 2006 2296 2340 2357 2514 2797 2887 2896 3226 256 410 799 1126 1377 1409 1518 1619 1829 2037 2303 2324 2472 2475 2874 2992 862 1522 1905 809 842 945 561 1001 2857 2132 2592 2905 217 401 1894 11 30 1860 210 1188 2418 1372 2273 2455 407 2537 2962 939 2401 2677 2521 3077 3173 1374 2250 2423 23 188 1320 472 714 2144 2727 2755 2887 1814 2824 2852 148 1695 1845 595 1059 2702 1879 2480 2578 17 411 559 146 783 2154 951 1391 1979 1507 1613 3106 642 882 2356 1008 1324 3125 196 1794 2474 1129 1544 2931 765 1681 2591 1550 1936 3048 1596 1607 2794 156 1053 2926 1246 1996 3179 348 752 1943. an encoding unit configured to perform LDPC coding on the basis of a parity check matrix of an LDPC code with a code length N of 17280 bits and a code rate r of 13/16, wherein an LDPC code word of the LDPC code includes K information bits and M=N-K parity bits, the parity check matrix includes an MxK information matrix portion corresponding to the information bits and an MxM parity matrix portion corresponding to the parity bits, the parity matrix portion is a lower bidiagonal matrix in which elements of "1" are arranged in a step-like manner, the row weight of the parity matrix portion being 1 in the first row and 2 in all the remaining rows, the column weight being 1 in the last column and 2 in all the remaining columns, the information matrix portion is represented by a parity check matrix initial value table, and the parity check matrix initial value table is a table showing in its i-th row, 1≤i≤39, the positions of elements "1" in the 1+360x(i-1)-th column of the information matrix portion, and wherein based on each 1+360x(i-1)-th column, 1≤i≤39, columns 2+360x(i-1) through 360xi of the information matrix portion are determined by cyclically shifting downward the respective preceding column by M/360, and is given by 225 274 898 916 1020 1055 1075 1179 1185 1343 1376 1569 1828 1972 2852 2957 3183 548 602 628 928 1077 1474 1557 1598 1935 1981 2110 2472 2543 2594 2721 2884 2981 59 69 518 900 1158 1325 1367 1480 1744 2069 2119 2406 2757 2883 2914 2966 3232 1330 1369 1712 2133 2206 2487 2596 2606 2612 2666 2726 2733 2754 2811 2948 3030 391 542 689 748 810 1716 1927 2006 2296 2340 2357 2514 2797 2887 2896 3226 256 410 799 1126 1377 1409 1518 1619 1829 2037 2303 2324 2472 2475 2874 2992 862 1522 1905 809 842 945 561 1001 2857 2132 2592 2905 217 401 1894 11 30 1860 210 1188 2418 1372 2273 2455 407 2537 2962 939 2401 2677 2521 3077 3173 1374 2250 2423 23 188 1320 472 714 2144 2727 2755 2887 1814 2824 2852 148 1695 1845 595 1059 2702 1879 2480 2578 17 411 559 146 783 2154 951 1391 1979 1507 1613 3106 642 882 2356 1008 1324 3125 196 1794 2474 1129 1544 2931 765 1681 2591 1550 1936 3048 1596 1607 2794 156 1053 2926 1246 1996 3179 348 752 1943. 225 274 898 916 1020 1055 1075 1179 1185 1343 1376 1569 1828 1972 2852 2957 3183 548 602 628 928 1077 1474 1557 1598 1935 1981 2110 2472 2543 2594 2721 2884 2981 59 69 518 900 1158 1325 1367 1480 1744 2069 2119 2406 2757 2883 2914 2966 3232 1330 1369 1712 2133 2206 2487 2596 2606 2612 2666 2726 2733 2754 2811 2948 3030 391 542 689 748 810 1716 1927 2006 2296 2340 2357 2514 2797 2887 2896 3226 256 410 799 1126 1377 1409 1518 1619 1829 2037 2303 2324 2472 2475 2874 2992 862 1522 1905 809 842 945 561 1001 2857 2132 2592 2905 217 401 1894 11 30 1860 210 1188 2418 1372 2273 2455 407 2537 2962 939 2401 2677 2521 3077 3173 1374 2250 2423 23 188 1320 472 714 2144 2727 2755 2887 1814 2824 2852 148 1695 1845 595 1059 2702 1879 2480 2578 17 411 559 146 783 2154 951 1391 1979 1507 1613 3106 642 882 2356 1008 1324 3125 196 1794 2474 1129 1544 2931 765 1681 2591 1550 1936 3048 1596 1607 2794 156 1053 2926 1246 1996 3179 348 752 1943.