To assure sound shield between the booths while maintaining the open feeling in the office under the condition that signal cables are laid under the floor panel for the wiring as before.

The office space is partitioned, with wall panels 12a, 12b into an isle 11 and many booths B, B,... which are allocated via this isle 11, the floor panes 13, 13,... for wiring are laid only to the isle 11 portion, the wall panel 12a allocated along the isle 11 is allocated direct on the floor 14 of office in such a manner that the lower side surfaces 12a1 of the wall panel 12a is placed in contact with the side surface 13a of the floor panel 13 for wiring laid in the isle 11, and a wire leading port 13b for guiding a signal cable 15 wired under the floor panel 13 for wiring into each booth B, B... is formed to the side surface 13a portion of the floor panel 13 for wiring adjacent to each booth B, B,....