To provide a universal grinding device capable of grinding blade components having various shapes.

This grinding device 10 is used for grinding a disc blade 16 by rotating a grinding wheel 14 of a grinder 12 and by abutting the disc blade 16 for a weed cutter with the turning grinding wheel 14. In this case, the grinding device is composed by providing a separating-closing means 18 for separating and closing the disc blade 16 from/to the grinder 12, and a grinder moving means 20 for moving the grinder 12 in a direction nearly vertical to the separating-closing direction.