PROBLEM TO BE SOLVED: To restrict reduction of cooling efficiency.SOLUTION: This invention relates to a cool temperature storage device 10 comprising a refrigeration chamber 21； a heat storage chamber 22； a cooling means 55 for cooling both refrigeration chamber 21 and the heat storage chamber 22； heating means 45 for heating the heat storage chamber 22； and a control part 60 to cause the cooling means 55 to perform both chambers cooling operation for cooling both chambers of the refrigeration chamber 21 and the heat storage chamber 22 and cool the refrigeration chamber 21 and the heating means 45 to perform a single chamber heating operation for heating the heat storage chamber 22. The control part 60 controls the cooling means 55 in such a way that a temperature in the refrigeration chamber 21 is in a range of the first temperature difference A1 in respect to a set temperature TA at the time of the both chambers cooling operation, and controls the cooling means 55 in such a way that a temperature in the refrigeration chamber 21 is in a range of the second temperature difference A2 different from the first temperature difference A1 in respect to the set temperature TA at the time of the single chamber heating operation.【課題】冷却効率の低下を抑制する。【解決手段】冷蔵室２１と、温蔵室２２と、冷蔵室２１及び温蔵室２２を冷却する冷却手段５５と、温蔵室２２を加熱する加熱手段４５と、冷却手段５５に冷蔵室２１及び温蔵室２２の両室を冷却する両室冷却運転、及び、冷蔵室２１を冷却し、加熱手段４５に温蔵室２２を加熱する片室加熱運転を行わせる制御部６０と、を備えた冷温蔵装置１０であって、制御部６０は、両室冷却運転時には、冷蔵室２１の温度が設定温度ＴＡに対して第１温度差Ａ１の範囲内となるように冷却手段５５を制御するとともに、片室加熱運転時には、冷蔵室２１の温度が設定温度ＴＡに対して第１温度差Ａ１とは異なる第２温度差Ａ２の範囲内となるように冷却手段５５を制御する。【選択図】図６
