This case study examines the seat selection at the time of arrival in a small-scale non-territorial office. The questionnaire to the workers reveals that 23% of workers consider that their seat selections affect their business and 67% of workers prefer to change their seats to avoid other worker’s voice. The observation of the seat selection at the office shows that many workers tend to fix their own seats. Even when they miss the seats, they select another seat in the same area (table). Some particular areas are hardly used while the other areas are frequently selected. And the seats at the corner of each area are occupied first. Some workers select the area where the particular worker sit.