Locking unit comprising a locking bolt which can be arranged on a window or door leaf of a window or a door and is pivotable in a window or door frame between a closed position and at least one open position, and a locking bearing which can be arranged on the associated window or door frame of the window or door leaf and/or a wall or window sill portion adjacent thereto, which has a receiving region into which the locking bolt is pivotable in order to form a locking position of the locking unit, when the locking bolt is pivotably fixed in its position of use to the window or door leaf and the locking bearing is fixed in a stationary way adjacent thereto in its position of use to the window or door frame or to the wall or window sill portion, wherein the locking bolt, in its position of use, is fixed to the window or door leaf to be pivotable by means of a locking bolt bearing element at least on a circular path section, preferably rotatable, and laterally pivotable into the locking position, and has a bearing hole and a stepped bearing having a central bore, penetrating the bearing hole, which has a braking element configured as a spring ring and increasing the frictional force, characterized in that the locking bolt has a two-part stepped bearing penetrating the bearing hole, the locking bolt bearing element having two stepped bearing elements (9.1, 9.2) with a central bore (11.1, 11.2), which each have a cover plate (7.1, 7.2) dimensioned larger in diameter than the bearing hole and engage in the bearing hole from opposite sides respectively with a stepped bearing region (6.1, 6.2), wherein at least one cover plate (7.1) has on its surface facing the locking bolt the friction force-increasing braking element configured as a spring ring, and in that the locking bolt has at one of its ends a first curved region and the locking bearing has at one of its ends a second curved region which forms the receiving region, into which the first curved region can be pivoted laterally in order to form the locking position of the locking unit, and wherein the first curved region and the second curved region form at least partially overlapping a form-fit connection blocking a horizontal and a vertical movement of the first curved region when the first curved region is pivoted into the second curved region in the locking position of the locking unit. characterized in that the locking bolt has a two-part stepped bearing penetrating the bearing hole, the locking bolt bearing element having two stepped bearing elements (9.1, 9.2) with a central bore (11.1, 11.2), which each have a cover plate (7.1, 7.2) dimensioned larger in diameter than the bearing hole and engage in the bearing hole from opposite sides respectively with a stepped bearing region (6.1, 6.2), wherein at least one cover plate (7.1) has on its surface facing the locking bolt the friction force-increasing braking element configured as a spring ring, and in that the locking bolt has at one of its ends a first curved region and the locking bearing has at one of its ends a second curved region which forms the receiving region, into which the first curved region can be pivoted laterally in order to form the locking position of the locking unit, and wherein the first curved region and the second curved region form at least partially overlapping a form-fit connection blocking a horizontal and a vertical movement of the first curved region when the first curved region is pivoted into the second curved region in the locking position of the locking unit.