PROBLEM TO BE SOLVED: To provide a mounting structure that allows a linear cutter to be mounted to a rotating body in various forms.SOLUTION: A rotating body 2 includes four locking members 32 for hooking a linear cutter 4, and four through-holes 38 for drawing out the linear cutter 4 from the rotating body 2 to the outside in the radial direction. The four locking members 32 are disposed to surround a rotating shaft 26 at equal intervals in the circumferential direction. The four through-holes 38 are disposed to surround the rotating shaft 26 at equal intervals in the circumferential direction. A virtual line L1 extending from an inner opening 34 of each through-hole 38 through an external opening 36 thereof is set inclining in an anti-rotating direction r2 to the virtual line L1 radially extending from the rotating shaft 26 through the inner opening 34.