To accommodate an underwater article without tying a sinking object in a bottom or a floating object under/on the water with a rope and without worker's direct touch to the underwater article, collect and float the underwater article with maintaining original shape of the underwater article as thoroughly as possible, carry the underwater article to nearby land, and land the underwater article without touching the underwater article.

In this landing device for the underwater article, the inner circumference of an annular buoyancy body that is an air inflation chamber inflated by the filling-up of air or gas is detachably installed with the periphery of a bottom-forming net, and several belts supporting the bottom-forming net are disposed perpendicularly to the longitudinal direction of the annular buoyancy body and are fixed to the annular buoyancy body. The bottom-forming net is detachably mounted to the annular buoyancy body by a fixture such as a hook-and-loop fastener to form a bottom face.