PROBLEM TO BE SOLVED: To provide techniques for a metal roof greening system with a firm structure, its construction work being easier and faster than a present method, its maintainability being excellent.SOLUTION: A greening system 1 comprises: greening trays 2 each having a side surface part provided so as to incline outward as it goes upward, and a collar part folded outward and formed at the upper end of the side surface part bearing members 4 each with fixing bolts erected on its upper part and installed at predetermined intervals and a plurality of long rail members 5 arranged in a line substantially orthogonal to a flow direction of a metal roof 3, each long rail member being formed in a reverse hat shape with a holding portion formed and supported on the bearing member 4 by inserting the fixing bolt. The greening tray 2 is press fitted and arranged such that the upper end of the side surface part of the greening tray 2 is positioned under the lower face of the holding part and the holding part abuts with the upper face of the collar part of the plurality of greening trays 2, thus preventing the greening trays 2 from floating.COPYRIGHT: (C)2012,JPO&INPIT【課題】強固な構造でありながら、より簡単且つ迅速な施工が可能であり、メンテナンス性にも優れた金属屋根の緑化技術を提供する。【解決手段】緑化システム1は、上にいくに従って外方に傾斜するように設けられた側面部と、側面部の上端において外方に折り返し形成されたつば部を有する緑化用トレー2と、上部に固定ボルトを立設され、所定の間隔で設置される支持部材4と、押え部が形成された断面視略逆ハット形状をなし、固定ボルトを挿通して支持部材4に支持され、金属屋根3の流れ方向に略直交して複数列置される長尺のレール部材5と、を備える。緑化用トレー2の側面部の上端が、押え部の下面に位置するように、緑化用トレー2が圧入して配置され、押え部が、複数の緑化用トレー2のつば部上面と当接して、緑化用トレー2の浮揚を防止するように構成される。【選択図】図1