<p>A refrigerator (50) provided with: a storage compartment for storing storage items, the compartment being partitioned by an insulating wall and an insulating door; a storage volume estimation unit (23) for estimating the storage volume of the storage compartment; and a memory unit (64) for recording the estimation result of the storage volume estimation unit (23). The refrigerator is further provided with a calculation controller (22) for calculating a storage change volume on the basis of the previous estimation result of the storage volume recorded in the memory unit (64) and the estimation result of the storage volume estimation unit, and controlling the output operation of electrical function components. The calculation controller (22) compares a preset threshold and the storage change volume, determines that the storage volume has changed when the storage change volume exceeds the threshold, and controls the output operation of the electrical function components.</p>
