| 摘要 |
PROBLEM TO BE SOLVED: To provide a gutter back board device attached to a corner part of crossing eaves of a roof to allow rainwater collected in a valley part of the roof to flow into a gutter smoothly. SOLUTION: This gutter back board device A formed on the gutter in the corner part of crossing eaves of the roof is composed of a transmitted water introduction face 1 bent into a round shape and a rainwater introduction face 3 hanging an upper end of the transmitted water introduction face 1 downward, and a rainwater introduction hole 4 is formed on the rainwater introduction face 3.
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