To provide a method for placing concrete into a hollow slab, by which excess water and bubbles in concrete are removed and concrete is placed under a dense and solid state.

In the method for placing concrete for the hollow slab in which concrete 2 is placed so that pipes 3 for forming hollow sections 11 in a concrete slab 1 are buried, permeating sections 30 permeating only water and air in the components of uncured concrete 2 are formed previously to the cylindrical surfaces 31 of the pipes 3, concrete 2 is placed, and water and air in concrete 2 are sucked from the permeating sections 30 by a suction pump 4 connected to the pipes 3 and discharged from the inside of concrete 2.