Collapsible furniture (1; 1') capable of moving from a flat folded position to a voluminous position of use, characterised in that it comprises a tubular structure having an upper shelf (10; 10') and a lower shelf (20; 20'), the tubular structure including: - a rear sheet (2; 2'), common to the two shelves (10, 20; 10', 20') forming a back wall (201; 201') and partially forming two side walls (3, 3', 4, 4') in the unfolded state of the furniture, and having a transverse fold line (7; 7') on the back wall defining said upper shelf (10; 10') and lower shelf (20; 20'), - two front upper (11, 11') and lower (21; 21') sheets, separate and distinct, forming in the unfolded state of the furniture, on the one hand, the front face (205; 205') and partially the side walls (5', 6') of the upper shelf (10; 10') and on the other hand, the front face (205; 205') and partially the side walls (5, 6) of the lower shelf (20; 20') respectively, - the rear sheet (2; 2') and the two front sheets (11, 21; 11', 21') being secured to each other at their longitudinal edges (30, 30'; 30", 30"') such as to form the tubular structure, said tubular structure having longitudinal fold lines (31, 31'; 31", 31"') on its walls, distributed between the front and rear sheets and allowing for the folding of each upper shelf (10; 10') and lower shelf (20; 20') in a flat position and unfolding into a voluminous position, said furniture comprising at least one rack (40; 40') for each lower and upper shelf, said rack (40; 40') respectively connecting the front face (205; 205') and the back wall (201; 201') of the furniture, extending between the side walls, and comprising a median fold line (41; 41') allowing for the folding/unfolding of the rack (40; 40') jointly with the folding/unfolding of the tubular structure, said rack (40; 40') acting as a strut between the side walls (3, 3', 4, 4', 5, 5', 6, 6') in the unfolded position of the furniture, such that in the position of least volume, the upper and lower shelves (10, 20; 10', 20') can be folded against each other, juxtaposed, thanks to the transverse fold line (7; 7') of the back wall, and be folded flat. - a rear sheet (2; 2'), common to the two shelves (10, 20; 10', 20') forming a back wall (201; 201') and partially forming two side walls (3, 3', 4, 4') in the unfolded state of the furniture, and having a transverse fold line (7; 7') on the back wall defining said upper shelf (10; 10') and lower shelf (20; 20'), - two front upper (11, 11') and lower (21; 21') sheets, separate and distinct, forming in the unfolded state of the furniture, on the one hand, the front face (205; 205') and partially the side walls (5', 6') of the upper shelf (10; 10') and on the other hand, the front face (205; 205') and partially the side walls (5, 6) of the lower shelf (20; 20') respectively, - the rear sheet (2; 2') and the two front sheets (11, 21; 11', 21') being secured to each other at their longitudinal edges (30, 30'; 30", 30"') such as to form the tubular structure, said tubular structure having longitudinal fold lines (31, 31'; 31", 31"') on its walls, distributed between the front and rear sheets and allowing for the folding of each upper shelf (10; 10') and lower shelf (20; 20') in a flat position and unfolding into a voluminous position,