A weight scale includes a load cell, an amplifier, and an A/D converter and further includes a CPU that: sets up the amplifier for a first measurement range and a first amplification factor and causes the amplifier to amplify an output voltage of the load cell and the A/D converter to convert an output of the amplifier from analog to digital, to obtain a first weight value of the measurement target； and sets up the amplifier for a second measurement range narrower than the first measurement range and a second amplification factor larger than the first amplification factor and then causes the amplifier to amplify an output voltage of the load cell and the A/D converter to convert an output of the amplifier from analog to digital, to obtain a second weight value of the measurement target.
