A signal detection device rapidly and accurately detects a desired signal from a reception signal. A correlation unit 231 outputs a correlation value string obtained by cross-correlating an input symbol string and a reference symbol string, a first position detection unit 232 detects a position of a correlation value viewed as a maximum or a local maximum on the correlation value string, a compensation unit 233 performs compensation by suppressing correlation error values from correlation value at positions other than the detected position, a second position detection unit 234 detects a position of a correlation value viewed as the maximum on the compensated correlation value string, and a sync-detected signal generation unit 235 outputs a sync-detected signal based on the position detected by the second position detection unit 234.