The present invention provides a non-woven fibrous sheet which comprises a base material layer containing thermal adhesive fibers formed with a non-woven fibrous structure in which fibers are fixed by fusion between the thermal adhesive fibers; wherein an average thickness of the base material layer is adjusted to 0.2 mm or more and less than 1 mm, and the thermal adhesive fibers are roughly evenly fused in a surface direction of the base material layer. The non-woven fibrous sheet can also have a surface layer disposed on at least one side of the base material layer which is formed with the non-woven fibrous structure with an apparent density higher than the base material layer. The surface layer can be a layer formed by hot pressing, also can be formed by meltblown nonwoven. The thermal adhesive fibers can also be roughly evenly fused in a thickness direction of the base material layer. The thermal adhesive fibers can contain an ethylene-vinyl alcohol copolymer which continuously extends toward a longitudinal direction on a surface of fiber. Although the non-woven fibrous sheet is a thin sheet, it has improved rigidity in bending, less deformation during the load being applied, and excellent formability.