Provided is a method for manufacturing such a drill head easily but reliably at a low cost as is given a high sizing precision and an edge precision by soldering cutting blade tips to the cutting bladProvided is a method for manufacturing such a drill head easily but reliably at a low cost as is given a high sizing precision and an edge precision by soldering cutting blade tips to the cutting blade seats of a head body. The method manufactures a drill head (10), in which a screw shank (2) is screwed and connected to the leading end portion of a tool shank (5) of a deep hole cutting drill, so te seats of a head body. The method manufactures a drill head (10), in which a screw shank (2) is screwed and connected to the leading end portion of a tool shank (5) of a deep hole cutting drill, so that constricting circumferential portions (22 and 23) on the two sides of a male thread portion (21) are used in close contact with the circumference of the tool shank (5). A shank cylinder member (20hat constricting circumferential portions (22 and 23) on the two sides of a male thread portion (21) are used in close contact with the circumference of the tool shank (5). A shank cylinder member (20A) having a cutting allowance (7) left at least on the constricting circumferential portions (22 and 23) is welded and integrated to the rear end of a head body (1) having cutting blade chips (30a toA) having a cutting allowance (7) left at least on the constricting circumferential portions (22 and 23) is welded and integrated to the rear end of a head body (1) having cutting blade chips (30a to30c) soldered thereto, and the cutting allowance (7) of the shank cylinder member (20A) is cut and finished into the screw shank (2).30c) soldered thereto, and the cutting allowance (7) of the shank cylinder member (20A) is cut and finished into the screw shank (2).