The purpose of this study is to investigate the relationship between spatial information and cognitive distance(CD) in an architectural space. The subjects have used the building of experiment for more than 2years, they estimated each walk of the 10 routes in there. Each of those routes(50m-144m) is longer than the standard route(34m). Before estimating the distance, the pictures of both ends and some places from the routes were given on display. Ratio method was used to obtain the CD data. The CD data were converted to logarithm before analyzing, and compared with the real walks. Then, the CD data of approximate walk were paired, and each pair was compared. As a result, the CD in an architectural space depend not only on the amount of the spatial information but also the spatial conditions (width, height, and opening) of the routes.