The present invention discloses an extrusion die adapted to be mounted on an extruding machine (1) at the tip thereof and having a flat plate unit of a predetermined thickness provided with a plurality of through-holes. In the extrusion die of the present invention, the flat plate unit includes a first flat plate (2) made of ceramics and a second flat plate (3) made of a metallic material overlappingly disposed outside of the first flat plate (2). The through-holes (5) in the second flat plate (3) are coaxial with the through-holes (4) in the first flat plate (2) and have a diameter greater than that of the through-holes (4) in the first flat plate (3).
