Abstract
This paper reports on findings of outdoor stage "playhouse" in Nagano prefecture that represent about 50 percent of the whole. The outdoor stages is investigated by two points, one is a field survey of the form, the other is a hearing from the inhabitant. Furthermore we analyze the data that obtain from the survey by the statistical method, and try to classify outdoor stage into architectural form. Results are summarized as follows. 1) The existence of outdoor stages will be influenced by social programs since the Edo era. 2) The outdoor stages are classified under four groups into architectural form of scale, plan, structures, location and so on.
