FIXTURE

To prevent a fire retardant property from being reduced by falling of a piece of glass having high fireproof strength.SOLUTION: A fixture comprises: an inner sash 20 at a frame body 10's portion to be on the indoor side; and an outer sash 30 at the frame body 10's portion to be on the outdoor side, the inner sash 20 and the outer sash 30 being constructed by mounting stiles on four peripheries of respective surface materials 21, 31. The surface materials 21, 31 of the inner sash 20 are pieces of multi-layered glass composed of wire-reinforced glass 21b, 31b and float glass 21c, 31c that have fireproof strength differing from each other and are disposed so as to face each other. The inner sash 20 includes an inside vertical stile 22 to be a meeting stile, the inside vertical stile having a hollow inside vertical stile base 22d. In stiles constituting the inner sash 20 and the outer sash 30, a reinforcement material 27 molded using material having a linear expansion coefficient smaller than that of the inside vertical stile 22 is disposed only in the inside vertical stile base 22d.SELECTED DRAWING: Figure 3 【課題】耐火強度の高いガラスが脱落することに起因して防火性が低下する事態を防止する。【解決手段】枠体１０の室内側となる部分に内障子２０を備えるとともに、枠体１０の室外側となる部分に外障子３０を備え、内障子２０及び外障子３０は、それぞれ面材２１，３１の四周に框を装着することによって構成された建具であって、内障子２０の面材２１，３１は、耐火強度が互いに異なる網入りガラス２１ｂ，３１ｂ及びフロートガラス２１ｃ，３１ｃが対向して配置された複層ガラスであり、内障子２０において召し合わせとなる内方縦框２２は、中空状の内方縦框基部２２ｄを有し、内障子２０及び外障子３０を構成する框には、内方縦框基部２２ｄにのみ、内方縦框２２よりも線膨張係数の小さい材質によって成形された補強材２７が配設されている。【選択図】図３