Abstract: A ball-point pen (1) includes a reservoir (2) communicating with a hole (10) connected to a capillary channel (3) of a tip (4) which is provided with a cavity (9) which seats the ball (5) for writing, this ball (5) being kept pressed against a retaining edge (9t) of the cavity (9) as a result of the thrust of a compression resilient spring (6) terminating in a straight portion (6r) which is aligned with the longitudinal axis (N-N) of the ball-point pen (1) and the free end (6p) of which is in contact with the ball (5). In the ball-point pen (1), the capillary channel (3) has, inside it, elements (7) which, coming into contact with the straight portion (6r) of the spring (6), prevent it from becoming inclined with respect to the longitudinal axis (N-N) of the ball-point pen (1).