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 fixed to the intake grille for lifting and lowering the intake grille by unwinding or winding the pair of wires ; the first unit comprises: a first drum on which the pair of wires 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 spaced apart from the first drum , and the pair of wires is wound thereon; an end roller disposed between the first drum and the start roller , and the pair of wires is wound thereon; a start roller shaft providing a center of rotation of the start roller ; and an end roller shaft providing a center of rotation of the end roller , wherein the center of rotation of the end roller moves along the end roller shaft , and the center of rotation of the start roller is fixed on the start roller shaft . 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 fixed to the intake grille for lifting and lowering the intake grille by unwinding or winding the pair of wires ; the first unit comprises: a first drum on which the pair of wires 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 spaced apart from the first drum , and the pair of wires is wound thereon; an end roller disposed between the first drum and the start roller , and the pair of wires is wound thereon; a start roller shaft providing a center of rotation of the start roller ; and an end roller shaft providing a center of rotation of the end roller , wherein the center of rotation of the end roller moves along the end roller shaft , and the center of rotation of the start roller is fixed on the start roller shaft . a first drum on which the pair of wires 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 spaced apart from the first drum , and the pair of wires is wound thereon; an end roller disposed between the first drum and the start roller , and the pair of wires is wound thereon; a start roller shaft providing a center of rotation of the start roller ; and an end roller shaft providing a center of rotation of the end roller , wherein the center of rotation of the end roller moves along the end roller shaft , and the center of rotation of the start roller is fixed on the start roller shaft . a start roller spaced apart from the first drum , and the pair of wires is wound thereon; an end roller disposed between the first drum and the start roller , and the pair of wires is wound thereon; a start roller shaft providing a center of rotation of the start roller ; and an end roller shaft providing a center of rotation of the end roller , wherein the center of rotation of the end roller moves along the end roller shaft , and the center of rotation of the start roller is fixed on the start roller shaft . <EOS>