To provide a demodulator which is capable of calculating an accurate reception signal level for all times even at reception of a large power or reception of a small power.

An RF section 2 of the demodulator consists of a 1st BPF 2a and a variable RF amplifier 2b. An IF section consists of a 1st frequency converter 3a, a 2nd BPF 3b, a 1st level detector 3f, a variable IF amplifier 3c, a 2nd frequency converter 3d, a 3rd BPF 3e, and a 2nd level detector 3h, a 1st RSSI output means 3g that amplifies a 1st AGC signal from the 1st level detector 3f and that outputs a 1st RSSI signal, and a 2nd RSSI output means 3i that amplifies a 2nd AGC signal from the 2nd level detector to output a 2nd RSSI signal. Then a reception level calculation means 2b of a DSP section 6 calculates a reception signal level by using both the RSSI signals from both the RSSI output means 3g, 3i.