| 摘要 |
PROBLEM TO BE SOLVED: To improve appearance by eliminating an engaging hole or the like for height adjustment and making the structure of the upper end part of a column slim. SOLUTION: At least one of the end parts of the column for supporting a top plate 1 is turned to a tubular shape, a projecting part 7 projecting from the inner peripheral surface of the tube to an inner side is provided and a height adjuster 6 where the groove groups 9a-9b and 10a-10c of respectively different vertical fitting positions to be fitted to the projecting part 7 are formed is provided. Then, one of the respective groove groups 9a-9b and 10a-10c is fitted to the projecting part 7 and the column 2 and the height adjuster 6 are piled up and attached in a vertical direction.
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