To facilitate forming work of a building wall-end structure, for imparting a desired appearance and sealing performance.

The building wall-end structure is formed of a base roof 9 laid on a surface of a roof main body 4, a wall 3 erected adjoining to the roof main body 4, and upper and lower thick plain ridge tiles 10, 11 which are arranged at a corner defined by the roof main body 4 and the wall 3, and superposed on each other. The building wall-end structure is further formed of: a wall end retainer 13 which extends along the corner, has one lateral end thereof connected to the wall 3 and the other end thereof connected to a surface of the base tile 9, and allows the lower thick plain ridge tile 11 to be mounted on an upper surface thereof; a lower draining member 21 which is located closer to the wall 3 than the lower thick plain ridge tile 11, retained by the wall end retainer 13, allows a wall 3 side end of the lower thick plain ridge tile 11 to be fitted therein and engaged therewith, and allows the upper thick plain ridge tile 10 to be mounted on an upper surface thereof to engage with the same; and an upper draining member 25 which extends along the corner, and has one lateral end thereof connected to the wall 3 and the other end thereof connected to a surface of the upper thick plain ridge tile 10.