Writing instrument with press mechanism and magnetic catch

A writing instrument with a pressure mechanism for the movement against a spring pressure of a writing element (4, 5, 6, 11, 12, 13) from a retracted position of rest into an advanced writing position, in which the writing element (4, 5, 6, 11, 12, 13) is retained against the writing pressure and from which it can be returned into the position of rest by means of spring pressure by the displacement of a retention element (18, 19, 20) out of an engagement position with an instrument housing (1, 2, 14, 15), wherein the retention element (18, 19, 20) has a cup section (18) open towards the rear, the axial length of which is greater than its inner diameter and into which has been inserted a ball (23) of a magnetizable material which is axially freely movable back and forth, and wherein a permanent magnet (16) is disposed adjacent to the opening of the cup section (18), the surface of which oriented towards the cup section (18) has a concave contact surface (17) disposed coaxially to the writing element for the ball (23), and in that the retention power exerted by the permanent magnet (16) on the ball (23) resting against it is less than the weight of the ball (23).