| 摘要 |
PROBLEM TO BE SOLVED: To secure rational fitting dimensions with interior and exterior materials of a building, realize a minimum window frame estimated dimension for reduction of material cost, improve bonding strength in assembling a heat insulation window frame and suppress condensation occurring on an indoor metal part. SOLUTION: A left vertical frame 1 is constituted of an exterior metal part 1a on an outdoor side, an interior metal part 1b on an indoor side and a resin part 1c interposed between the interior metal part 1b and the exterior metal part 1a. The interior metal part 1b and the exterior metal part 1a are screwed to upper and lower frames 3, 4. The left vertical frame 1 is provided with a resin auxiliary frame 5 covering the resin part 1c and the interior metal parts 1b, 2b and formed integrally with a frame hooking part 5f.
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