To ensure smooth dental treatment activity by improving the stability and operability of a reamer and file and preventing the medical treatment accident in treatment using the reamer and the file.

The manual cutting appliance 10 comprises a cutting portion 20 and a clamping portion 30. The clamping portion 30 is so formed that respective cross sections are made into a nearly square shape. A recessed part is formed in the central portion and further the appliance has plural projecting parts on its flanks. Accordingly, the stability and operability in the treatment are improved and the medical treatment accident is prevented.