In the syringe barrel (12), an inner peripheral portion (26) of the barrel portion (18) includes, in a main area in an axial direction, a tapered portion (28) having an inner diameter gradually increased toward a distal end from a proximal end. A injection molding mold (50) includes: a female mold (52) having a cavity (53) that is a recessed portion adapted to mold an outer surface of the syringe barrel (12)； and a male mold having a core (65) provided with a barrel portion molding section (66) to mold the inner peripheral portion (26) of the barrel portion (18). The barrel portion molding section (66) of the core (65) includes, in a main area in an axial direction, a tapered molding section (67) having an outer diameter gradually increased from a proximal end to a distal end.
