A coat removing method of removing a coat of a coated optical fiber 3 made of a glass fiber 3a and the coat of polyimide resin 3b covering the glass fiber 3a includes holding the coated optical fiber 3 with fiber clamps 5 and 7 at two locations spaced by a predetermined distance in a length direction of the coated optical fiber 3, applying tension to the coated optical fiber 3 in the length direction, pressing a coat removal blade 29 to the coated optical fiber 3 in the tension-applied state in a direction crossing the length direction, to bend the coated optical fiber 3, and moving the coat removal blade 29 in the length direction along the coated optical fiber 3 in the bent state, thereby removing the coat.
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