PURPOSE: To make a convenient functional eraser formed by integrating different eraser materials so as to provide a plurality of functions being inexpensive and safe, and to provide a rational manufacturing method of the eraser by utilizing a plurality of manufacturing machines.

CONSTITUTION: After different erasing materials are mixed, it is heated, melted, unified, and extruded continuously by using a plurality of extrusion molding machines. Thereafter, a functional eraser obtained by integrating the different erasing materials and the erasing material obtained by melting and mixing by using the extrusion molding machines are charged into in a hopper. It is softened by a screw in a heating cylinder and the softened erasing material is extruded from an extrusion mold continuously so as to manufacture the functional eraser.