PROBLEM TO BE SOLVED: To easily execute installation work of an architrave member, regardless of a state of a remodeling building.SOLUTION: In an upper architrave member 31 and a new frame 20, the new frame 20 is provided with a first temporary fixing part 40 for temporarily fixing the upper architrave member 31. In the upper architrave member 31, the upper architrave member 31 is opposed to the new frame 20 in a state of being temporarily fixed to the new frame 20 by the first temporary fixing part 40, and a joining wall part 31a connected to the new frame 20 is provided by a connector. The upper architrave member 31 and a vertical architrave member 32 are provided with a second temporary fixing part 50 for temporarily fixing the vertical architrave member 32 to the upper architrave member 31. In the vertical architrave member 32, the vertical architrave member 32 is opposed to the new frame 20 in a state of being temporarily fixed to the upper architrave member 31 by the second temporary fixing part 50, and a joining wall part 32a connected to the new frame 20 is provided by the connector.SELECTED DRAWING: Figure 13
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