PURPOSE: To provide an emery saw which effects running of a cut disc throughout a wide range, to performs cutting of a material to be cut in a plurality of spots through a single emery saw, reduces fear of distortion occurring owing to heat radiated from the material to be cut or vibration thereof, and facilitates maintenance.

CONSTITUTION: A gantry type frame 5 is erected such that a horizontal member 6 is caused to span above a material 2 to be cut. A running body 9 runnable approximately horizontally along the horizontal member 6 is supported in a suspending state. A cutting disc 21 rotated in a surface paralleling to the horizontal member 6 is elevatably arranged to the running body 9.