To provide a building-mounting sheath pipe which can maintain the strength of a foundation by preventing the concrete of the foundation from cracking even if some pulling force works.

A building-mounting sheath pipe 10 buried in a foundation in order to secure a building unit to the foundation via a foundation bolt is formed to include a sheath pipe main body 11 filled with a fixing filler and into which the foundation bolt is inserted and a reinforcing member 12 integrated with the sheath pipe main body 11 and joined to the reinforcement of the foundation 1. Therefore, the strength of the building mounting sheath pipe 10 becomes so great that even if some pulling force works on the building mounting sheath pipe 10, foundation concrete will not crack, thus enabling the strength of the foundation to be maintained.