A shading device (100, 200, 300, 500, 600, 900) suitable for at least partially covering a wall opening, such as a window, said device (100, 200, 300, 500, 600, 900) comprising, at least: - a protective element such as a cloth (110, 210, 510, 610), suitable for at least partially covering said wall opening, - a support for fastening said protective element (110, 210, 510, 610), comprising at least: - an upper transverse element (112, 212, 512, 612, 912) suitable for holding an upper part of the cloth (110, 210, 510, 610), comprising a first and a second end, - a lower transverse element (113, 213, 513, 613, 913) suitable for holding a lower part of the cloth (110, 210, 510, 610), comprising a first and a second end, said transverse elements (112, 212, 512, 612, 912, 113, 213, 513, 613, 913) being suitable to be fastened essentially in parallel, preferably in parallel, in a transverse direction in said wall opening, by: - a first guide (120, 220, 920) suitable for being vertically fastened in the side wall of said wall opening, and for receiving and movably retaining a sliding member (114, 214, 514) of a first end of said support, - a second guide (121, 221) suitable for being fastened in a longitudinal direction in said wall opening, and suitable for receiving and movably retaining a sliding member (115, 215, 315, 515, 915) of a second end of said support, characterised in that the device (100, 200, 300, 500, 600, 900) is equipped with a gripping element which is movable between a first position to allow the sliding members (114, 214, 514, 115, 215, 315, 515, 915) to move relative to the guides (120, 220, 920, 121,221) and a second position for fastening the sliding members (114, 214, 514, 115, 215, 315, 515, 915) in the guides (120, 220, 920, 121, 221) and thus immobilising the position of the device relative to the desired wall opening, and in that the support is fastened on the sliding members (114, 214, 514, 115, 215, 315, 515, 915) to enable adjustment of the inclination of the support relative to the guides (120, 220, 920, 121, 221) and wherein the gripping element is formed by at least a part of said support, the first position and the second position of said gripping element corresponding, respectively, to a first and to a second inclination of the support relative to said guides (120, 220, 920, 121,221). - a protective element such as a cloth (110, 210, 510, 610), suitable for at least partially covering said wall opening, - a support for fastening said protective element (110, 210, 510, 610), comprising at least: - an upper transverse element (112, 212, 512, 612, 912) suitable for holding an upper part of the cloth (110, 210, 510, 610), comprising a first and a second end, - a lower transverse element (113, 213, 513, 613, 913) suitable for holding a lower part of the cloth (110, 210, 510, 610), comprising a first and a second end, - an upper transverse element (112, 212, 512, 612, 912) suitable for holding an upper part of the cloth (110, 210, 510, 610), comprising a first and a second end, - a lower transverse element (113, 213, 513, 613, 913) suitable for holding a lower part of the cloth (110, 210, 510, 610), comprising a first and a second end, - a first guide (120, 220, 920) suitable for being vertically fastened in the side wall of said wall opening, and for receiving and movably retaining a sliding member (114, 214, 514) of a first end of said support, - a second guide (121, 221) suitable for being fastened in a longitudinal direction in said wall opening, and suitable for receiving and movably retaining a sliding member (115, 215, 315, 515, 915) of a second end of said support,