To provide a receiver, an error-correction decoding device and an error-correction decoding method in which error-correction processing is performed by rightly calculating the likelihood value in the communication environment where a received signal power is fluctuated but an S/N is not fluctuated or in the communication environment where the received signal power and a noise power are independently fluctuated.

Whether or not a soft decision likelihood value is to be corrected is decided based on the fluctuation quantity of a noise power component in a received signal or presence/absence of fluctuation of the S/N and based on the decided result, the soft decision likelihood value is corrected as needed, so that an error-correction capability is prevented from being lowered by the unwanted correction.