A denture base is fabricated with reduction of workload of a technician. A method for fabricating a denture base 20 includes: preparing a cutting target mold 40 including molding space 48; attaching a first rod member 17 and a second rod member 18 to the cutting target mold 40; injecting a denture base material 8 into the molding space 48 and hardening the denture base material 8 to obtain a hardened object, thereby molding a cutting target 5; cutting a portion of the cutting target 5 with a cutting machine 60; and detaching the first rod member 17 and the second rod member 18.