No.1 in achieving customer satisfaction

We are committed to genuine customer satisfaction and trust through the provision of better office planning.

  • President's Message

    A message from Takayuki Tatsumi, President of No. 1 Co., Ltd. More details

  • Corporate Identity

    Our raison d'etre and code of conduct More details

  • History

    History of No.1 since its foundation and of its evolution into the No.1 company More details

  • Corporate Profile

    Basic information about No.1 Co., Ltd. (date of establishment, capital, business details, offices, service bases, etc.)More details

  • Business base

    Address and access method of each branch.