To simply attach a planar material drop out prevention implement to a heat insulation screen with neither forming exclusive bolt holes nor special works.

An outdoor side metallic stile 30 and an indoor side metallic stile 31 are connected through heat insulation materials 32, 33. In a screen frame 20 in which a plurality of heat insulation stiles and rails 22, 23, 24, ... are assembled in a rectangular frame shape, a planar material 21 is fitted to constitute a heat insulation screen. By screwing assembling bolts 38 into the end of bolt hole 35 formed along the longitudinal direction, a planar material drop out preventive implements 40 are attached to the outdoor side material rail members 30, 30.

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