To escape damage like a natural disaster by eliminating running water as quickly as possible, though the landslides tend to frequently occur because stream flow pressure is made immense in many cases, on a mountainside, a piedmont, a cliff area and the like, particularly, a dangerous area wherein the earth's crust is soft, at the time of heavy rainfall and snowfall.

In a structure of a landslide preventing pipe, the pipe is composed of a suction pipe, and a semi-permeable water running part and a semi-smooth-surface water running part are formed on the inside peripheral surface part of the water running passage of the pipe in such a manner as to be almost symmetrical to the inside periphery of the suction pipe.