Phase error detector and optical disc device

An optical disc device comprising:

• a sine wave generator configured to generate a sine wave signal, based on a first input signal of a first period;
• a cosine wave generator configured to generate a cosine wave signal, based on the first input signal;
• a first calculator configured to calculate a phase difference between the sine wave signal and a second input signal of a second period;
• a second calculator configured to calculate a phase difference between the cosine wave signal and the second input signal;
• a first selection unit configured to output, as a phase error, the phase difference calculated by the first calculator when the phase difference calculated by the second calculator is within a predetermined range, and outputs, as the phase error, a predetermined value having a same sign as a sign of the phase difference calculated by the first calculator when the phase difference calculated by the second calculator is out of the predetermined range;
• and
• a clock generator configured to generate a clock, using the phase error.