To propose a communication device capable of easily calibrating frequency error and obtaining position information with high accuracy. The communication device includes a frequency error detecting circuit that receives a reception signal, detects frequency error contained in the reception signal, and generates frequency error correction output, main frequency error correcting means that corrects the frequency error contained in the reception signal based on the frequency error correction output, and main correlation calculating means that performs calculation of correlation between reception output which frequency error has been corrected by the main frequency error correcting means and a pseudo random noise code, and a data processing circuit that outputs position information with respect to the radio wave source based on the output from the main correlation calculating means.