A bioelectrical impedance measuring apparatus may include an impedance measuring unit configured to provide an inspection current based on a predetermined current to a living body, and obtain an inspection voltage corresponding to an impedance of the living body, an amplification unit configured to amplify the inspection voltage with reference to a correction voltage, an AD converter configured to AD-convert an output of the amplification unit, and a control unit configured to control the inspection current and the correction voltage based on an AD-converted result of the AD converter such that the output of the amplification unit is within an input dynamic range of the AD converter, and calculate an impedance average of the living body and an impedance variation of the living body based on the predetermined current, the correction voltage and the AD-converted result.