| 摘要 |
PROBLEM TO BE SOLVED: To reduce a flushing noise by reducing generation of a seal breaking sound without spoiling a flushing capacity in a siphon toilet stool. SOLUTION: In the flush toilet stool that is provided with a trap drain passage, which comprises a stool bowl to store reserved water, a rising part communicating with the stool bowl, a weir, and a descending part, and a flushing mechanism in which water from a water supply source is discharged and the reserved water is discharged from the trap drain passage, a squeezing part to squeeze the trap drain passage in the width direction is provided in the section from the inlet of the trap drain passage to 100 mm at the position from a trap ceiling part to 20 mm so as to control a velocity field of the flushing water that flows inside the rising part at the time of toilet stool flushing using the flushing mechanism.
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