| 摘要 |
A cutting tool includes: a body 2 that rotates about an axis center; a hole portion 3 that is open in a tip end surface 2 of the body 2; a wall portion 4 that is formed of the hole portion 3 and an outer circumferential surface 2b of the body 2; a notch portion 5 that is communicated with the hole portion 3; and a blade portion 6 that is formed or held at a portion where the notch portion 5 intersects with the tip end surface of the wall portion 4. The blade portion 6 includes an inner side surface 6h that passes through an inner end portion 6e of the bottom blade 6a and intersects with a rake surface through a ridge line. The inner side surface 6h is inclined to depart from a virtual cylindrical side surface towards the direction opposite to the rotational direction of the body 2.
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