To provide a bathtub device capable of keeping both the inside temperature and the warming feeling in the comfort temperature zone and continuing to feel the warmth even after taking a bath for a long time.SOLUTION: The bathtub apparatus 1 of the present invention comprises a bathtub 2, a heating portion (a neck heating heater 12 and a back heating heater 14) provided on the inner wall surface of the bathtub, a temperature control of the heating portion , And the control unit automatically controls the temperature of the heating unit and the heating time so as to keep the temperature and the warming sensation of the bather in the respective comfort temperature zones Wherthe control unit is configured to alternately execute a temperature increasing step in which the temperature of the heating section rises and a temperature lowering step in which the temperature of the heating section is decreased, and the control section is configured to control the temperature And controls the heating unit so that the temperature change rate in the rising step is greater than the temperature change rate in the temperature lowering step.BACKGROUND OF THE INVENTION【課題】長時間入浴しても、体内温度と温感の両方を快適温度ゾーン内に収め続けることができると共に温かさを感じ続けることが可能な浴槽装置を提供する。【解決手段】本発明の浴槽装置1は、浴槽2と、浴槽の内部の壁面に設けられた加温部(首加温ヒータ12と背中加温ヒータ14)と、加温部の温度を制御する制御装置18と、を有し、制御部は、入浴者の体内温度と温感をそれぞれの快適温度ゾーン内に収め続けるように、加温部の温度と加温時間を自動で制御する自動運転モードを有し、制御部は、加温部の温度が上昇する温度上昇工程と、加温部の温度が下降する温度下降工程が交互に実行されるように構成され、制御部は、温度上昇工程における温度変化率が温度下降工程における温度変化率よりも大きくなるように加温部を制御する。【選択図】図1
