To provide a separating cutter capable of cutting, breaking apart, separating and recovering a cylindrical body or a columnar body by one separating cutter and capable of improving workability.

A separating cutter 11 is provided with a flat rectangular support stand 12 and mounted on the upper end of a bottomed cylindrical receiving container 14 at both ends in the longitudinal direction. A punching plate 17 having many insertion holes 16 having the specified diameters is screwed to the lower part of the support stand 12 to close the upper end opening part of the receiving container 14. A rotational cutting part for circumferentially cutting the peripheral surface of a cylindrical body or a columnar body and a press-cutting part for pressing and cutting an article to be cut are provided on the support stand 12. An oil filter as a cylindrical body is provided with a bottomed cylindrical cover and a base plate provided on the lower end of the cover, and a filter part is housed in it.