A cord mounting for a tension cord of an architectural covering, the cord mounting including: a mounting base configured for mounting adjacent an architectural structure; and a cord holder configured to engage at least one cord; wherein the mounting base includes a mounting part configured to be mounted adjacent an outside edge of the architectural structure; the mounting base includes a holder part extending in a first direction, the holder part having first and second sides (128, 130) opposite each other with respect to a second direction substantially perpendicular to the first direction, and defining a through hole extending between the first and second sides (128, 130) for passage of at least one cord therethrough; the cord holder and the holder part are configured to engage with each other with the cord holder adjacent said first side such that at least one cord may extend from the cord holder through the through hole from said first side to said second side; the holder part includes an opening extending longitudinally at least partly in the first direction, extending in the second direction and extending between the first side and the second side with a lateral width in a third direction perpendicular to the first and second directions and the cord holder includes a protrusion extending in the second direction and configured to extend into the opening and across the lateral width of the opening; characterized in that, with the cord holder engaged with the holder part, the opening and the protrusion cooperate to resist movement of the cord holder at least away from the mounting part and from moving laterally with respect to the mounting base, and the protrusion fills only a part of the opening and defines said through hole between the protrusion and the holder part. a mounting base configured for mounting adjacent an architectural structure; and a cord holder configured to engage at least one cord; wherein the mounting base includes a mounting part configured to be mounted adjacent an outside edge of the architectural structure; the mounting base includes a holder part extending in a first direction, the holder part having first and second sides (128, 130) opposite each other with respect to a second direction substantially perpendicular to the first direction, and defining a through hole extending between the first and second sides (128, 130) for passage of at least one cord therethrough; the cord holder and the holder part are configured to engage with each other with the cord holder adjacent said first side such that at least one cord may extend from the cord holder through the through hole from said first side to said second side; the holder part includes an opening extending longitudinally at least partly in the first direction, extending in the second direction and extending between the first side and the second side with a lateral width in a third direction perpendicular to the first and second directions and the cord holder includes a protrusion extending in the second direction and configured to extend into the opening and across the lateral width of the opening; characterized in that, with the cord holder engaged with the holder part, the opening and the protrusion cooperate to resist movement of the cord holder at least away from the mounting part and from moving laterally with respect to the mounting base, and the protrusion fills only a part of the opening and defines said through hole between the protrusion and the holder part.