Abstract: An apparatus for making a noodle base having a construction wherein raw materials of a noodle base are kneaded and stretched in an arbitrary direction by a screw conveyor and extruded as a noodle base having a thick sheet-like form. The extrusion die has a split die structure consisting of a die main body having the upper surface thereof open and a cover body supported rotatably at the base end portion of the die main body and covering the open portion of the die main body, and the cover body is provided with a cover body pushing member for pushing the tip portion of the cover body lest the cover body float up, and for adjusting the height of an extrusion port of the noodle base by adjusting the height of the tip portion of the cover body relative to the die main body.