The subject-matter of the invention is a water draining cover (1) for an automotive windshield wiping mechanism, containing a positive connection element (4) of the cover, adapted for securing on the body (2) of the shaft (11), containing an opening on the shaft (5) and surrounded by a gutter part (6) containing a drainage opening (7), characterized in that the positive connection element of the cover (4) does not have a continuous rotary symmetry with regard to the X axis, and in each transverse section in the plane perpendicular to the X axis it has the shape of a convex figure, and furthermore the positive connection element of the body (3) has means of blocking the movement of the cover (1) in a direction parallel to the X axis when the cover (1) is mounted on the body (2), preferably in the form of at least one projection and/or recess (9), preferably perpendicular to the X axis, while the X axis is defined as a straight line passing through the opening on the shaft (5), coinciding with the axis of rotation of the shaft (11) when the cover (1) is properly mounted on the body (2). The subject-matter of the invention is also the body (2) of a shaft (11) corresponding to the cover of the invention, as well as an automotive windshield wiper mechanism containing the cover (1) and the body (2).