A phase compensation device comprising: a symbol phase difference compensating portion calculating a first phase difference which is a phase difference between a known pattern extracted from a received signal and a true value of the known pattern and performing phase compensation for the received signal based on the first phase difference; a tentative determination portion tentatively determining an output signal of the symbol phase difference compensating portion to acquire an estimated value of a phase; a first phase difference acquiring portion acquiring a second phase difference which is a phase difference between a phase of the output signal and the estimated value of the phase acquired by the tentative determination portion; and a first phase difference compensating portion performing phase compensation for the output signal based on the second phase difference, characterised in that the tentative determination portion sets an estimated value of a phase for each of a plurality of threshold regions on a constellation, and determines an estimated value of a phase corresponding to a threshold region in which the output signal is included, the plurality of threshold regions include a first threshold region and a second threshold region having different shapes, an amplitude of a signal to which the second threshold region corresponds is larger than an amplitude of a signal to which the first threshold region corresponds, and the second threshold region extends in a phase rotation direction in comparison with the first threshold region, the first threshold region and the second threshold region are indicated only by threshold lines which indicate straight lines on an IQ plane. a symbol phase difference compensating portion calculating a first phase difference which is a phase difference between a known pattern extracted from a received signal and a true value of the known pattern and performing phase compensation for the received signal based on the first phase difference; a tentative determination portion tentatively determining an output signal of the symbol phase difference compensating portion to acquire an estimated value of a phase; a first phase difference acquiring portion acquiring a second phase difference which is a phase difference between a phase of the output signal and the estimated value of the phase acquired by the tentative determination portion; and a first phase difference compensating portion performing phase compensation for the output signal based on the second phase difference, characterised in that the tentative determination portion sets an estimated value of a phase for each of a plurality of threshold regions on a constellation, and determines an estimated value of a phase corresponding to a threshold region in which the output signal is included, the plurality of threshold regions include a first threshold region and a second threshold region having different shapes, an amplitude of a signal to which the second threshold region corresponds is larger than an amplitude of a signal to which the first threshold region corresponds, and the second threshold region extends in a phase rotation direction in comparison with the first threshold region, the first threshold region and the second threshold region are indicated only by threshold lines which indicate straight lines on an IQ plane.