To obtain a data slice circuit capable of correctly executing binarization when a maximum time of continuing the same signal level in a succeeding data section requiring correct binarization is longer than a section length of a preamble section for a fixed period of time without requiring the correct binarization, and also, capable of securing noise resistance.

When an output signal of a comparator 4 fluctuates for a fixed period of time, a converging voltage Vhpf of an HPF 3 is set to the same voltage as the reference voltage Vref0. When the output signal of the comparator 4 continues for a fixed period of time with a code 1, the converging voltage Vhpf of the HPF 3 is set to a voltage Vrefp1 higher than the reference voltage Vref0 by a prescribed fixed voltage. When the output signal of the comparator 4 continues for a fixed period of time with a code 0, a converging voltage Vhpf of an HPF 4 is set to a voltage Vrefn1 lower than the reference voltage Vref0 by a prescribed fixed voltage.