To provide a concrete composition containing polyvinyl alcohol based staple fibers, having good workability to enable the slab floor work having good cracking resistance, free from the protrusion of fibers from the surface of applied concrete floor and the generation of rust and magnetic field and suitable for floor slab work in or out of a building.

The objective composition contains 3-13 kg of polyvinyl alcohol based staple fibers in 1 m3 of freshly mixed concrete. The polyvinyl alcohol based staple fiber is composed of a plurality of signal fibers integrated to form a bundle with an adhesive composed of an organic and has a fiber length of 10-50 mm. The integrated fiber bundle has a flexibility of 100-500 g/bundle.