To provide a mounting structure of a vertical gutter in a base isolation structure and a connecting pipe for the gutter capable of making the construction cost low without destroying the gutter by earthquake motion.

The mounting structure of the vertical gutter in the base isolation structure is constituted by connecting the lower end of the leader 5 on the side of the structure mounted on the base isolation structure side getting rid of the earthquake motion is connected to the upper end of the leader 6 on the side of the ground 2 mounted on the side of the ground 2 with a group 7 of a plurality of connecting pipes, a group 7 of connecting pipes comprises an upper connecting pipe 10 fixed to the lower end of the leader 5 on the side of the structure 1, a lower connecting pipe 11 fixed to the upper end of the leader 6 on the side of the ground 2 and a plurality intermediate connecting pipes 12, 13 and 14 constituted by arranging them between the upper connecting pipe 10 and the lower connecting pipe 11.