FLUSH TOILET BOWL DEVICE

To provide a flush toilet bowl device capable of suppressing generation of wasted water while washing a toilet bowl using washing water stored in a washing water tank and washing water supplied from a water supply source.SOLUTION: A flush toilet bowl device (1) of the present invention comprises: a flush toilet bowl body (2); a washing water tank body (10); a drain valve (12) that discharges and stops washing water stored in the washing water tank body; a branching part (33) that branches washing water supplied from a water supply source into a first branch flow channel and a second branch flow channel; a first on-off valve (19) that is installed in the first branch flow channel and switches between discharging and stopping the washing water from the upper water discharge port; a second on-off valve (17) that is provided in the second branch flow channel and switches between supplying and stopping supply of the washing water to the washing water tank body; and a control part (28) that controls the first on-off valve and the second on-off valve so that water is discharged from the upper water discharge port and the water is supplied into the washing water tank body at the same time by opening the first on-off valve and the second on-off valve.SELECTED DRAWING: Figure 3 【課題】洗浄水タンクに貯留された洗浄水、及び給水源から供給された洗浄水を使用して便器洗浄を行いながら、無駄水の発生を抑制することができる水洗大便器装置を提供する。【解決手段】本発明は水洗大便器装置(1)であって、水洗便器本体(2)と、洗浄水タンク本体(10)と、この洗浄水タンク本体内に貯留された洗浄水を排出、停止する排水弁(12)と、給水源から供給された洗浄水を第１、第２分岐流路に分岐させる分岐部(33)と、第１分岐流路に設けられ、上部吐水口からの洗浄水の吐水、停止を切り替える第１開閉弁(19)と、第２分岐流路に設けられ、洗浄水タンク本体内への洗浄水の給水、停止を切り替える第２開閉弁(17)と、第１、第２開閉弁を開弁させることにより、一時に上部吐水口からの吐水、及び洗浄水タンク本体内への給水が行われるように、第１開閉弁及び第２開閉弁を制御する制御部(28)と、を有することを特徴としている。【選択図】図３