PURPOSE: To enable the furniture to be combined, to be neatly arranged according to all states by forming a top board and shelf boards to be slightly larger, and by cutting to make smaller according to opening dimensions.

CONSTITUTION: A pair of lower section equipments 11, 11 or 21, 22 with a plurality of engaged shelf steps on side surfaces composing housing sections and confronted with each other are arranged at an interval in a state set on both the sides of their setting place. Then, both the ends or one end of a top board 14 to be set on a pair of the lower section equipments 11, 11 or 21, 22 are cut to be made smaller according to the opening dimension S of the setting place, and the top board 14 is fixed to be combined with the upper section of the respective lower section equipments 11, 11 or 21, 22. Besides, both the ends or one end of shelf boards 19 to be arranged between a pair of the lower section equipments 11, 11 or 21, 22 are cut to be made smaller according to the arranged interval of both the lower section equipments 11, 11 or 21, 22 based on the opening dimension S, and the shelves 19 are engaged with the respective lower section equipments 11, 11 or 21, 22. As a result, they can be arranged neatly in appearance at the setting place.