WASHING WATER TANK DEVICE AND WATER CLOSET WITH THE SAME

To provide the washing water tank device capable of suppressing leakage of washing water from an exhaust port due to a fact that a water head pressure necessary for sealing cannot be sufficiently secured due to shape limitation of a water storage tank, even when the water head pressure cannot be sufficiently secured.SOLUTION: The washing water tank device comprises a drain pipe provided at an exhaust port having an opening so as to be positioned above a water stop level, wherein a position adjusting means for changing a height position of a drain pipe opening in a vertical direction during bedpan washing is disposed inside the water storage tank, and the washing water tank device can suppress the leakage of the washing water from the exhaust port by flowing an overflow from the opening into the exhaust port even when the water head pressure cannot be sufficiently secured.SELECTED DRAWING: Figure 2 【課題】貯水タンクの形状的制限によってシールに必要な水頭圧が十分に確保できない場合であっても、これに起因する排水口からの洗浄水の漏洩を抑制することができる洗浄水タンク装置を提供する。【解決手段】排水口に設けられ、止水水位よりも上方に位置するよう開口が形成された排水管と、を備え、便器洗浄時に上下方向に排水管の開口の高さ位置を変化させる位置調整手段が貯水タンクの内部に配置され、開口からの溢水を前記排水口に流入させることで、水頭圧が十分に確保できない場合であっても排水口からの洗浄水の漏洩を抑制できる。【選択図】図２