A measuring device comprising: a first signal generation section configured to generate a first source signal including a fundamental and a plurality of harmonics based on a reference physical quantity, a first physical quantity, and a second physical quantity; a first removal section configured to remove some or all of the plurality of harmonics from the first source signal; and a measurement section, wherein the first removal section includes a first summing section configured to sum the first source signal and a harmonic signal having the same frequency as a removal target harmonic among the plurality of harmonics to output a first summed signal, the measurement section inputs therein the first summed signal, which is an analog signal, and outputs a first measurement signal, which is a digital signal, and the first removal section further includes: a harmonic generation section (9[n]) configured to generate the harmonic signal; a first Fourier transform section configured to calculate a plurality of harmonics included in the first measurement signal; and a first control section configured to cause the harmonic generation section to adjust, based on the calculation of the first Fourier transform section, either or both of an amplitude and a phase of the harmonic signal so that a harmonic that matches the removal target harmonic is removed from the first measurement signal. a first signal generation section configured to generate a first source signal including a fundamental and a plurality of harmonics based on a reference physical quantity, a first physical quantity, and a second physical quantity; a first removal section configured to remove some or all of the plurality of harmonics from the first source signal; and a measurement section, wherein the first removal section includes a first summing section configured to sum the first source signal and a harmonic signal having the same frequency as a removal target harmonic among the plurality of harmonics to output a first summed signal, the measurement section inputs therein the first summed signal, which is an analog signal, and outputs a first measurement signal, which is a digital signal, and the first removal section further includes: a harmonic generation section (9[n]) configured to generate the harmonic signal; a first Fourier transform section configured to calculate a plurality of harmonics included in the first measurement signal; and a first control section configured to cause the harmonic generation section to adjust, based on the calculation of the first Fourier transform section, either or both of an amplitude and a phase of the harmonic signal so that a harmonic that matches the removal target harmonic is removed from the first measurement signal. a harmonic generation section (9[n]) configured to generate the harmonic signal; a first Fourier transform section configured to calculate a plurality of harmonics included in the first measurement signal; and a first control section configured to cause the harmonic generation section to adjust, based on the calculation of the first Fourier transform section, either or both of an amplitude and a phase of the harmonic signal so that a harmonic that matches the removal target harmonic is removed from the first measurement signal.