It is considered to be the ruins of the teahouse which was described as 'forty-chome teahouse' in "Meguri" and as 'about 3.927 kilometers up from Yanaimoto' in "Guidebook," and there still remains a trace of a stone wall.
『めぐり』に「四十丁目茶屋」、『案内記』に「やない本より壱里上り」と記された場所と考えられており、石垣の跡がある。