To provide a data reproducing device in which deterioration in a transfer rate is prevented as much as possible while conducting a correct data decoding.

The data reproducing device generates likelihood information in accordance with a repeated decoding method corresponding to a turbo coding method from sampling values obtained by sampling reproduced signals from a recording medium (110) using a prescribed period and generates decoded data based on the data bits obtained by conducting hard discrimination for the likelihood information. The data reproducing device is provided with reliability discriminating means (4772, 4773 and 4774) which are used to determine whether the data bits are obtained from the likelihood information in a prescribed range, where the reliability of the hard discrimination is not sufficient, or not and an error correction decoding means (50) which conducts an error correcting decoding for the data bits in accordance with a prescribed rule while considering the discrimination result of the corresponding reliability discriminating means and generates the decoded data.