PROBLEM TO BE SOLVED: To provide a bathtub apparatus capable of continuing to keep both an intra-body temperature and a warm feeling to a comfortable temperature zone even in bathing for a long time.SOLUTION: A bathroom apparatus 1 includes a bathtub 2, a neck warming heater 12 and a back warming heater 14 provided on a wall surface 10 on a side against which a bather H inside the bathtub leans, and a control device 18 for controlling the temperatures of the neck warming heater and the back warming heater. The control device has an automatic operation mode for automatically controlling the respective temperatures and warming times of the neck warming heater and the back warming heater so as to keep an intra-body temperature of the bather and a warm feeling that the bather has to respective comfortable temperature zones. In the automatic operation mode, the control device executes control to make the input heat quantity per unit area of the neck warming heater is smaller than the input heat quantity per unit area of the back warming heater.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2018,JPO&INPIT【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、この浴槽の内部の入浴者Ｈがもたれる側の壁面１０に設けられた首加温ヒータ１２及び背中加温ヒータ１４と、これらの首加温ヒータ及び背中加温ヒータの温度を制御する制御装置１８と、を有し、制御装置は、入浴者の体内温度と入浴者が感じる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、首加温ヒータと背中加温ヒータのそれぞれ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、制御装置は、自動運転モードにおいて、首加温ヒータの単位面積当たりの投入熱量が背中加温ヒータの単位面積当たりの投入熱量よりも小さくなるように制御する。【選択図】図１
