Milling cutter and blade part thereof

A milling cutter comprising:

• a blade part having a plurality of tips each provided with an end cutting edge and a peripheral cutting edge, and a blade-body portion which is a plate-shaped body with the plurality of tips fixed to an outer circumference thereof and has a groove in accordance with a position of each tip;
• a body being rotatable around a rotational axis and transmitting a rotational driving force to the blade-body portion from outside, the body having a front-end portion, the front-end portion having a front-end surface to which a rear-end surface of the blade-body portion is fixable detachably and in close contact therewith, and a front-end outer-circumferential portion whose outer diameter is 100/100 to 97/100 using an outer diameter of the blade-body portion as a reference (100/100), the front-end outer-circumferential portion having a body-side groove continuous to the groove of the blade-body portion contacted closely;
• and
• a fastening bolt to be fastened to the body, penetrating through the blade-body portion from a front-end surface side,
• wherein the rear-end surface of the blade-body portion is formed to be a flat plane surface, and the blade-body portion is provided with an attachment hole provided at the front-end surface side of the body and having a cylindrical outer peripheral surface around which an attachment seat is fitted to, and a fastening bolt hole provided around the attachment hole for penetrating the fastening bolt therethrough from the front-end surface towards the body for fixing thereto.