| 摘要 |
PROBLEM TO BE SOLVED: To provide a drain structure of a bathroom unit capable of preventing a backflow in a bathtub when draining a large quantity of water from a washing place and capable of preventing a backflow to a tub waterproof pan when draining a large quantity of water from the bathtub. SOLUTION: This drain structure of a bathroom unit drains water from a bathtub 1 and a tub waterproof pan 2 arranged under it. Then, the drain structure has a backflow preventive body part 20 for forming a tub drain hole 21 and a pan drain hole 22 for draining water from the bathtub 1 and draining water from the tub waterproof pan 2 and a blocking-up plate 30 installed on an under surface of this backflow preventive body part 20, capable of alternately closing the tub drain hole 21 and the pan drain hole 22 and always closing the tub drain hole 21.
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