Showcase for preservation and display of objects, comprising a fixed casing (10; 110; 210) and at least one openable panel (20; 120; 220) made of glass mounted on the fixed casing (10; 110; 210) through opening supports (30; 130; 230), the opening supports comprising: - a pair of upper rods (31 a; 131 a; 231 a) and a pair of lower rods (31b; 131b; 231b), pivoted to the fixed casing (10; 110; 210) at respective first upper (32a; 132a; 232a) and lower (32b; 132b; 232b) rod pins; - an intermediate structure (40; 140; 240), pivoted to the upper and lower rods (31; 131; 231) at respective second upper (33a; 133a; 233a) and lower (33b; 133b; 233b) rod pins; wherein the rod pins (32, 33; 132, 133; 232, 233) have a pivoting axis parallel to a main direction; characterised in that all the rods (31 a;131 a;231 a;31 b;131 b;231 b) have a same length and the distance on the fixed casing (10; 110; 210) between the first upper rod pins (32a; 132a; 232a) and the distance on the intermediate structure (40; 140; 240) between the second upper rod pins (33a; 133a; 233a) are equal to each other, as well as the distance on the fixed casing (10; 110; 210) between the first lower rod pins (32b; 132b; 232b) and the distance on the intermediate structure (40; 140; 240) between the second lower rod pins (33b; 133b; 233b) are equal to each other, so that the four rods (31; 131; 231) form an articulated parallelogram system for the movement of the intermediate structure (40; 140; 240) with respect to the fixed casing (10; 110; 210); - the opening supports also comprising a hinging system (51; 151; 251) along the main direction, between the openable panel (20; 120; 220) and the intermediate structure (40; 140; 240), so as to allow the openable panel (20; 120; 220) to rotate with respect to the intermediate structure (40; 140; 240). - a pair of upper rods (31 a; 131 a; 231 a) and a pair of lower rods (31b; 131b; 231b), pivoted to the fixed casing (10; 110; 210) at respective first upper (32a; 132a; 232a) and lower (32b; 132b; 232b) rod pins; - an intermediate structure (40; 140; 240), pivoted to the upper and lower rods (31; 131; 231) at respective second upper (33a; 133a; 233a) and lower (33b; 133b; 233b) rod pins; wherein the rod pins (32, 33; 132, 133; 232, 233) have a pivoting axis parallel to a main direction; characterised in that all the rods (31 a;131 a;231 a;31 b;131 b;231 b) have a same length and the distance on the fixed casing (10; 110; 210) between the first upper rod pins (32a; 132a; 232a) and the distance on the intermediate structure (40; 140; 240) between the second upper rod pins (33a; 133a; 233a) are equal to each other, as well as the distance on the fixed casing (10; 110; 210) between the first lower rod pins (32b; 132b; 232b) and the distance on the intermediate structure (40; 140; 240) between the second lower rod pins (33b; 133b; 233b) are equal to each other, so that the four rods (31; 131; 231) form an articulated parallelogram system for the movement of the intermediate structure (40; 140; 240) with respect to the fixed casing (10; 110; 210); - the opening supports also comprising a hinging system (51; 151; 251) along the main direction, between the openable panel (20; 120; 220) and the intermediate structure (40; 140; 240), so as to allow the openable panel (20; 120; 220) to rotate with respect to the intermediate structure (40; 140; 240).