PROBLEM TO BE SOLVED: To provide a decorative frame mounting structure for windows and a decorative frame mounting method for windows, which makes it possible to easily mount a decorative frame around a window. SOLUTION: The decorative frame mounting structure for windows is provided around a window 200 of a house, and a structure 10 such as a pillar or a beam of the house arranged around the window 200 and a structure surrounding the window 200. One of the outer wall panel 110 and the outer wall panel 110, which is arranged outside the furring wall 120 so as to surround the window 200, at a predetermined distance from the outer wall of the structure 10. And a decorative frame 100 arranged around the window 200, and the position of the outer wall panel end 110t on the window 200 side of the outer wall panel 110 is such that a gap S is generated from the window end 200t of the window 200. The spacers 210 and 220 are arranged in the gap S at a predetermined distance W, and the decorative frame 100 covers the spacer 210 and a part of the outer wall panel 110 so as to include the outer wall panel end 110t. .. [Selection diagram] Fig. 5
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