Cutter machine

A cutter machine, comprising:

• a first blade;
• a second blade configured to rotate relative to the first blade;
• a base member supporting the first blade and the second blade;
• a screw member including a head portion and a shaft portion extending from the head portion which is a proximal end of the shaft portion and threaded with an outer thread, wherein the screw member fastens the first blade and the base member to each other by having the outer thread screwed with an inner thread;
• a looseness restraint member attached to the shaft portion and configured to be pressed by the head portion to restrain loosening of the screw member;
• and
• a fall-off restraint member attached to the shaft portion on a distal side of the shaft portion relative to the looseness restraint member and configured to restrain the looseness restraint member from moving relative to the shaft portion in a direction from a proximal side to the distal side of the shaft portion.