A turbo decoding device includes a memory unit that stores data in an interleaving process performed in a process of decoding a coded signal encoded with a turbo code and an access unit that accesses the memory unit to read and write the data. The memory unit includes memory circuits and is formed as one memory space by coupling the memory circuits. Furthermore, the memory circuit functions as a first bank configuration by which a first capacity is assigned to each bank or a second bank configuration by which a second capacity is assigned to each bank in accordance with a combination of the memory circuits. Moreover, the access unit selects by which of the first bank configuration and the second bank configuration the memory unit functions in accordance with a communication method of a coded signal and accesses the memory unit in accordance with the selected bank configuration.