Provided is a technology for the production of an outer tube for a pre-filled syringe having high transparency and produced by using a cyclic olefin resin as a raw material therefor. In the method for producing the outer tube for a pre-filled syringe formed by injection molding a cyclic olefin resin composition, the surface roughness of the core of an injection molding mold, for molding the outer tube for the pre-filled syringe, is adjusted to a specific range, and an outer tube for the pre-filled syringe is produced that has a light ray transmittance of at least 70% when light having a wavelength of 450 nm vertically incident to the side wall of the outer tube of the pre-filled syringe has passed through said side wall.提供一種以環狀烯烴樹脂作為原料而進行製造且製造具有高度透明性之預填注射器用外筒的技術。在製造對於環狀烯烴樹脂組成物來進行射出成形而組成之預填注射器用外筒之方法，為了成形預填注射器用外筒，因此，在特定之範圍，調整射出成形用模具之芯部之表面粗糙度，將對於預填注射器用外筒之側壁呈垂直地射入之波長450nm之光來透過前述側壁時之光線透過率為70%以上的預填注射器用外筒予以製造。
