PROBLEM TO BE SOLVED: To provide a corner member fixing structure which stably fixes corner members 20, 30 on a saddle-joint folded plate roof R for formation of a roof floor greening structure.SOLUTION: The corner member fixing structure functions to fix the corner members 20, 30 enclosing a peripheral edge of a water retaining/draining substrate material or the like arranged on the saddle-joint folded plate roof R. A saddle-joint protrusion 4 at a location to which each of the corner members 20, 30 is to be fixed, has a clamp 60 or 60a fixed thereto in a manner pinching the saddle-joint protrusion on both right and left sides by means of a pair of clam pieces. Each fixed clamp is provided with corner member support body 40 or 65a, and thus the corner members 20, 30 are fixed to the saddle-joint protrusions by using the corner member support bodies.COPYRIGHT: (C)2008,JPO&INPIT【課題】立ちはぜ折板屋根Rの上に屋上緑化構造体のための見切り材20,30を安定的に固定する。【解決手段】立ちはぜ折板屋根Rの上に配置した保水排水基盤材等の外縁部を囲う見切り材20,30の立ちはぜ折板屋根への固定構造であって、見切り材20,30を固定すべき位置における立ちはぜ突条4には、一対のクランプ片で立ちはぜの突条を左右から挟み付けるようにしてクランプ60,60aが固定される。固定されたクランプは見切り材支持体40,65aを備えており、該見切り材支持体を利用して見切り材20,30が固定される。【選択図】図2