Myouo-taro built as chief constructor many temples and shrines in Sagami-koku region in the pre-modern period. He enlarged his sphere of construction making close relationships with its social background. There were some factors for expansion of his construction activities around Mt.Oyama. This paper points out three factors: First, he took many pupils, and they got works for him. Second, the people named "Oshi"(guides) lived in Mt.Oyama had huge network for Oyama-dera temple. Third, the people named "Danka"(supporters) had common information about Mt.Oyama.
