The concentration of municipal functions towards the station terminal area of the city center is proceeding, and the underground facilites with related accesses are expanding in number, in order to reduce traveling time and distance between the transportation network and business or commercial facilities. This trend has resulted in highly complex underground building development. The planning of these underground passageways and facilities was necessarily restricted by existing buildings and planning regulations and also safety measures imposed by fire codes and building regulations. Despite these extensive design limitations which exist in the public interest underground passageways in the Tokyo metropolitan area are badly planned without regard to an orderly layout of pedestrian behavior. They are by no means safe or convenient passages for pedestrians. This study of underground passages investigates the influence of surface and underground interconnecting spaces, examines the architectual and planning complexity in terms of behavioral response of the user, and studies the pedestrian's processing of visual information. The purpose of this research is to obtain basic data on the underground built environment-the planning criteria, effectiveness of graphic information, and the users response to and interpretation of spatial characteristics.