Abstract: A ballpoint pen refill which can be applied to a retractable ballpoint pen is provided. An ink 2 endowed with a thixotropic property and an ink follower 3 at the rear of this ink are contained within an ink tube 1 comprising a tip holder member 9 and an ink member 10. A ball 6 is held in a front end aperture 9a thereof. A ballpoint pen tip 4 having an inner reshaped surface 4f of a front end rim 4b that is formed into a spherical surface in the shape of the ball is fitted therein. A coil spring 7 that always presses the ball onto the inner reshaped surface is provided with a movable member 8 between the spring and ball. A stopper 5 provided with a ventilation means is fitted into a rear end of the ink tube. A partition portion 9g having an ink-flow passageway for restricting the amount of ink that flows and a rear end surface 9c is formed in an engagement portion 9d of the tip holder member 9 that is fitted in the ink member 10.

Abstract: A ball-point pen for water-soluble ink having a barrel with a vent hole, a cylindrical ink reservoir covered except at its exposed front and rear ends, and an ink feed core for supplying ink from the reservoir to a ball at the pen writing tip is provided with a hollow inner cover member comprising a cylindrical holding part for covering and holding a relatively long front portion of the reservoir and a cylindrical shielding part for partitioning the front exposed part of the reservoir and the feed core from the vent hole, the inner cover member being secured within the barrel by press-fitting the front end of the shielding part into a bore of the front end part of the barrel. Passages are provided for communication between the vent hole and the rear exposed end of the reservoir. Leakage of ink due to causes such as temperature change and impact force imparted to the barrel in the longitudinal direction thereof is thereby prevented.