A ceiling-type indoor unit of an air-conditioner comprising: a case having an inlet and an outlet provided downward; an intake grille disposed to be separable downward from the case; an elevator comprising a first unit coupled to a pair of wires (511, 512) fixed to the intake grille for lifting and lowering the intake grille by unwinding or winding the pair of wires (511, 512); the first unit comprises: a first drum on which the pair of wires (511, 512) is wound; a first drum motor rotating the first drum; the ceiling-type indoor unit characterized in that the first unit further comprises: a first roller box and a second roller box each comprising a start roller (551, 561) spaced apart from the first drum, and the pair of wires (511, 512) is wound thereon; an end roller (554, 564) disposed between the first drum and the start roller (551, 561), and the pair of wires (511, 512) is wound thereon; a start roller shaft (551a, 561a) providing a center of rotation of the start roller (551, 561); and an end roller shaft (554a, 564a) providing a center of rotation of the end roller, wherein the center of rotation of the end roller (554, 564) moves along the end roller shaft (554a, 564a), and the center of rotation of the start roller (551, 561) is fixed on the start roller shaft (551a, 561a). a case having an inlet and an outlet provided downward; an intake grille disposed to be separable downward from the case; an elevator comprising a first unit coupled to a pair of wires (511, 512) fixed to the intake grille for lifting and lowering the intake grille by unwinding or winding the pair of wires (511, 512); the first unit comprises: a first drum on which the pair of wires (511, 512) is wound; a first drum motor rotating the first drum; the ceiling-type indoor unit characterized in that the first unit further comprises: a first roller box and a second roller box each comprising a start roller (551, 561) spaced apart from the first drum, and the pair of wires (511, 512) is wound thereon; an end roller (554, 564) disposed between the first drum and the start roller (551, 561), and the pair of wires (511, 512) is wound thereon; a start roller shaft (551a, 561a) providing a center of rotation of the start roller (551, 561); and an end roller shaft (554a, 564a) providing a center of rotation of the end roller, wherein the center of rotation of the end roller (554, 564) moves along the end roller shaft (554a, 564a), and the center of rotation of the start roller (551, 561) is fixed on the start roller shaft (551a, 561a). a first drum on which the pair of wires (511, 512) is wound; a first drum motor rotating the first drum; the ceiling-type indoor unit characterized in that the first unit further comprises: a first roller box and a second roller box each comprising a start roller (551, 561) spaced apart from the first drum, and the pair of wires (511, 512) is wound thereon; an end roller (554, 564) disposed between the first drum and the start roller (551, 561), and the pair of wires (511, 512) is wound thereon; a start roller shaft (551a, 561a) providing a center of rotation of the start roller (551, 561); and an end roller shaft (554a, 564a) providing a center of rotation of the end roller, wherein the center of rotation of the end roller (554, 564) moves along the end roller shaft (554a, 564a), and the center of rotation of the start roller (551, 561) is fixed on the start roller shaft (551a, 561a). a start roller (551, 561) spaced apart from the first drum, and the pair of wires (511, 512) is wound thereon; an end roller (554, 564) disposed between the first drum and the start roller (551, 561), and the pair of wires (511, 512) is wound thereon; a start roller shaft (551a, 561a) providing a center of rotation of the start roller (551, 561); and an end roller shaft (554a, 564a) providing a center of rotation of the end roller, wherein the center of rotation of the end roller (554, 564) moves along the end roller shaft (554a, 564a), and the center of rotation of the start roller (551, 561) is fixed on the start roller shaft (551a, 561a).