Milling cutter and blade part thereof

The present invention addresses the problem of providing a low-cost milling cutter in which a blade can be easily replaced. The milling cutter is provided with: a blade section (10) having a plurality of blades (12) to which a bottom blade (121) and an outer peripheral blade (122) are attached, and a blade body section (11) configured as a plate-shaped body for fixing the plurality of blades (12) to the outer periphery, the blade body section (11) having grooves (113) formed corresponding to the positions of the blades (12); and a main body (20) that is rotatable about a rotation axis and has a tip section (21) that is provided with a tip surface to which the rear end surface of the blade main body section (11) can be affixed in a clinging and detachable manner, and a tip outer peripheral section having an outer diameter of 100/100 to 97/100 with respect to the outer diameter of the blade section (10), and in which a main body-side groove (211) is formed that is in contact with the groove (113) of the clingin