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 (H) and a vertical (V) 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 (H) and a vertical (V) 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 . <EOS>