PURPOSE: To amplify a broad reception signal with simple constitution by selecting respectively a resonance frequency of the 1st resonance circuit to the vicinity of the upper limit frequency of a reception frequency band and the resonance frequency of the 2nd resonance circuit to the vicinity of the lower limit frequency of the reception frequency band.

CONSTITUTION: An inductance L1 of a bar antenna 1l is selected properly so as to bring the resonance frequency of it with a capacitor C1 of the resonance circuit slightly higher than the upper limit frequency fmax (e.g., 1,611kHz) of the reception frequency band. Then L2 and C2 are selected so that the resonance frequency between the inductance L2 of a coil 3l and the capacitance C2 of a capacitor 17 is slightly higher than the lower limit frequency fmin (e.g., 153kHz) of the reception frequency band. Moreover, the overall frequency characteristic of a high frequency amplifier is made flat almost over the entire range of the reception frequency band by selecting properly both damping resistors R1 and T2. Thus, the tuning element such as a varactor diode is not required by adopting a stagger amplification circuit provided with the 1st and 2nd resonance circuits having a different resonance frequency respectively.