The subject is to improve the detection performance in the error detection of data using an ECC. A data processing device 1 includes an encoder device 2 that includes an encoder unit to generate an ECC by performing operations according to a first ECC generation matrix and an encoder unit 5 to generate an ECC by performing operations according to a second ECC generation matrix obtained by permutating a column of the first ECC generation matrix. The encoder unit 4 generates the first ECC for the first data. The encoder unit 5 generates the second ECC for the second data obtained by permutating a bit of the first data.