To provide a throwaway tip having a stabilized service life by restricting the generation of unexpected breakdown of a cutting blade when cutting a hard material having a high hardness.

In this negative type throwaway tip 101 with a coating layer 121 made of ceramic including alumina as a component and formed with a chamfering part 107 in a ridge part of the cutting blade, ceramic as the tip matrix 110 is exposed in the chamfering part 107. Crater abrasion is generated in the chamfering part 107, which is not formed with the coating layer 121, but the crater abrasion progresses in proportion to the cutting time to wear down the exposed ceramic, and the matrix is not scraped large at a time in a progressing process, and the generation of unexpected breakdown of the cutting blade can be prevented.