| 摘要 |
PROBLEM TO BE SOLVED: To enable inexpensive glass such as float glass, etc., to be used as rib glass. SOLUTION: A placing member 8 is fixed to a front surface facing to the outdoor I side of a mullion 1. The rib glass 7 is placed on the placing member 8. A holding member 9 is installed in the front surface part of the mullion 1. The rib glass 7 is coupled to the mullion 1 in such a manner as to be unable to move in the direction from the indoor I side toward the outdoor O side by means of the holding member 9.
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