A weight scale includes a load cell, an amplifier, an A/D converter, and a CPU that includes: a determining unit configured to determine whether the measurement target is a heavy object or a light object； and a classified weight measurement control unit configured to set up the amplifier, based on the determining as to whether the measurement target is the heavy object or the light object, for a measurement range narrower than a maximum measurement range of the amplifier and also for an amplification factor larger than an amplification factor used with the maximum measurement range, so as to match the heavy object or the light object, and thereafter cause the amplifier to amplify an output voltage of the load sensor and the A/D converter to convert an output of the amplifier from analog to digital, to obtain a weight value of the measurement target.
