A stacked-layers forming device for manufacturing a three-dimensional shaped object, comprising: a powder layer forming means for forming a powder layer of a powder material; and a solidified layer forming means for forming a solidified layer by irradiating a predetermined portion of the powder layer with a light beam, thereby allowing a sintering of the powder material in said predetermined portion or a melting and solidification thereof; wherein the three-dimensional shaped object with a plurality of the solidified layers stacked integrally is manufactured by repeating the step of forming the powder layer by means of the powder layer forming means and the step of forming the solidified layer by means of the solidified layer forming means; the device further comprising a powder replenishing means for supplying the powder material to above a base on which the powder layer and the solidified layer are formed or onto an upper surface of a base frame which surrounds the base; wherein the powder layer forming means comprises a slide member which is provided slidably along the upper surface of the base frame, wherein the slide member is capable of conveying the powder material, which has been supplied from the powder replenishing means, toward an upper surface of the base or thereabove, while leveling the surface of the conveyed powder material, and wherein, the slide member comprises a powder-supply frame which surrounds a region to which the powder material is to be supplied, characterized in that the powder replenishing means comprises an approximately cylindrical member in which the powder material is charged and a screw member which is installed within the approximately cylindrical member, wherein a rotation of the screw member conveys the powder material in the approximately cylindrical member, the powder replenishing means is provided movably in a direction approximately perpendicular to a sliding direction of the slide member. a powder layer forming means for forming a powder layer of a powder material; and a solidified layer forming means for forming a solidified layer by irradiating a predetermined portion of the powder layer with a light beam, thereby allowing a sintering of the powder material in said predetermined portion or a melting and solidification thereof; wherein the three-dimensional shaped object with a plurality of the solidified layers stacked integrally is manufactured by repeating the step of forming the powder layer by means of the powder layer forming means and the step of forming the solidified layer by means of the solidified layer forming means; the device further comprising a powder replenishing means for supplying the powder material to above a base on which the powder layer and the solidified layer are formed or onto an upper surface of a base frame which surrounds the base; wherein the powder layer forming means comprises a slide member which is provided slidably along the upper surface of the base frame, wherein the slide member is capable of conveying the powder material, which has been supplied from the powder replenishing means, toward an upper surface of the base or thereabove, while leveling the surface of the conveyed powder material, and wherein, the slide member comprises a powder-supply frame which surrounds a region to which the powder material is to be supplied, characterized in that the powder replenishing means comprises an approximately cylindrical member in which the powder material is charged and a screw member which is installed within the approximately cylindrical member, wherein a rotation of the screw member conveys the powder material in the approximately cylindrical member, the powder replenishing means is provided movably in a direction approximately perpendicular to a sliding direction of the slide member.