<p>A weight management device is provided with: a weight acquisition unit (62) for acquiring a set of weight data including a weight measurement value of a subject to be measured at a predetermined time in the day from when the subject awakes to when the subject sleeps, and a measurement date and time of the measurement value; a weight storage unit (64) for storing the weight data acquired by means of the weight acquisition unit into a memory; a representative weight calculation unit (66) for calculating a representative weight value from among the weight measurement values of the weight during a predetermined period and stored in the memory; and a target calculation unit (68) for calculating a target value to function as the target when measuring the weight value at the predetermined time from the calculated representative weight value, a daily target weight loss value, and a measurement value functioning as the factor for the weight fluctuation.</p>
