Cabin door (1) for an elevator comprising: two sliding door panels (2, 3) provided with corresponding profiles (6, 7) counter-shaped with one another, each of the profiles (6, 7) being arranged beneath the corresponding door panel (2, 3) and being integrally constrained to it; a motor (2) or a gearmotor or a linear magnetic induction motor operatively active on the profiles (6,7) to slide them with respect to one another so that said door panels (2,3) are indirectly moved between a first configuration wherein the cabin door (1) is closed and a second configuration in which the cabin door (1) is open; each of said profiles (6, 7) comprises a first portion (6a, 7a) integrally constrained to the corresponding door panel (2, 3) and a projecting second portion (6b, 7b), as a result of sliding of the profiles (6, 7) said projecting second portions (6b, 7b) assuming a position of minimum distance when the door panels (2, 3) are in the second configuration, so that said projecting second portions (6b, 7b) form a cabin threshold (5), and a position of maximum distance when the door panels (2, 3) are in the first configuration, so that said cabin threshold (5) is disassembled.