A product storage device (1) includes: first and second product storage chambers (52, 53) for storing products and for cooling or heating the stored products; a product delivery port (31) to which a product stored in the first or second product storage chamber (52, 53) is dispensed; and a control unit (10) configured to set one of the first and second product storage chambers (52, 53) as a preliminary chamber in which stored products are not available for dispensing and set the other as a product dispensing chamber in which stored products are available for dispensing, and configured to sequentially change product storage chambers to be set as the preliminary chamber.