To adjust the dimension of a frontage by at least two fillers by connecting a cuttable adjustment filler side end part to a fixed filler surface in an L shape.

This corner filler A is composed by connecting the cuttable adjustment filler 2 to the surface of a fixed filler 1 in the L shape and is adjusted by cutting the part of the adjustment filler 2. A frontage adjustment filler B is cuttable and the dimension of the frontage is adjusted by cutting. At the time of installing an L-shape kitchen 4 which is a kind of combination furniture to an L-shape frontage between walls 3, one dimension of the L-shape kitchen 4 is adjusted by the adjustment filler 2 of the corner filler A and the other dimension of the L-shape kitchen 4 is adjusted by the frontage adjustment filler B. Thus, efficiency is economically improved.