To provide a simple and economical cylindrical body for rotary cutting that is used to drill a concrete wall or floor board, or a rock bed.

A cylindrical body 2 has a cutting blade 3 at a top and also has a projection part 4 on a peripheral surface at least nearby the tip of the cylindrical body 2. Specifically, the cylindrical body 2 has the projection 4 on the peripheral surface, and a diameter (D2) connecting a projection top of the projection 4 in a radial section of the cylindrical body 2 is set to be equal to or a little larger than a cutting inner diameter (D1) of the cutting blade 3 (D2≥D1). Then a plurality of projections 4 are provided at equal intervals in a peripheral direction of the cylindrical body 2 and apart from one another in a length direction of the cylindrical body 2.