| 摘要 |
PROBLEM TO BE SOLVED: To ensure excellent washing performance regardless of the quantity of wash water in a flush toilet bowl with a jet hole directed toward a trap. SOLUTION: A jet water conveying way 199 of a siphon jet type toilet bowl 110 is composed of three parts that are a lead-in way 151, a relay way 152 and a lead-out way 153 and formed in horizontally drawn shape extending almost horizontally from a jet water supply hole 198. The jet water supply hole 198 is provided in a position slightly higher than the height Q1 from the installation face of the toilet bowl 110 to a weir 134 of a siphon trap duct 130. In the non-washing state of the toilet bowl 110, jet standing water RWz stays to the height of a normal water level line WL slightly lower than the jet water supply hole 198, and a space region S1 of slight volume is formed in a protuberant part 151ar lower than the normal water level line WL.
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