A moving picture decoding device configured to decode a bitstream in which moving pictures are coded by partitioning each picture of the moving pictures into first blocks of predetermined sizes, and first blocks into second blocks, the device comprising: a decoding unit configured to extract a differential quantization parameter of at least one of the second blocks by decoding the bitstream; a predictive quantization parameter deriving unit configured to derive a predictive quantization parameter of the at least one second block using quantization parameters of a third block which is located adjacent to the left of the at least one second block and a fourth block which is located adjacent to the top of the at least one second block; and a quantization parameter generation unit configured to generate a quantization parameter of the at least one second block by adding the differential quantization parameter of the at least one second block and the predictive quantization parameter of the at least one second block, wherein the predictive quantization parameter deriving unit sets the quantization parameter of the third block as a first quantization parameter when the third block is at a position not beyond a left boundary of the first block, sets a quantization parameter of a fifth block of the second blocks of the same picture decoded before the at least one second block as the first quantization parameter when the third block is at a position beyond the left boundary of the first block, sets the quantization parameter of the fourth block as a second quantization parameter when the fourth block is at a position not beyond an upper boundary of the first block, sets the quantization parameter of the fifth block as the second quantization parameter when the fourth block is at a position beyond the upper boundary of the first block, and derives an average of the first and second quantization parameters as the predictive quantization parameter of the at least one second block. a decoding unit configured to extract a differential quantization parameter of at least one of the second blocks by decoding the bitstream; a predictive quantization parameter deriving unit configured to derive a predictive quantization parameter of the at least one second block using quantization parameters of a third block which is located adjacent to the left of the at least one second block and a fourth block which is located adjacent to the top of the at least one second block; and a quantization parameter generation unit configured to generate a quantization parameter of the at least one second block by adding the differential quantization parameter of the at least one second block and the predictive quantization parameter of the at least one second block, wherein the predictive quantization parameter deriving unit sets the quantization parameter of the third block as a first quantization parameter when the third block is at a position not beyond a left boundary of the first block, sets a quantization parameter of a fifth block of the second blocks of the same picture decoded before the at least one second block as the first quantization parameter when the third block is at a position beyond the left boundary of the first block, sets the quantization parameter of the fourth block as a second quantization parameter when the fourth block is at a position not beyond an upper boundary of the first block, sets the quantization parameter of the fifth block as the second quantization parameter when the fourth block is at a position beyond the upper boundary of the first block, and derives an average of the first and second quantization parameters as the predictive quantization parameter of the at least one second block.