A coating removing device comprising: a main body that includes a blade (21A, 23A) configured for making an incision in a coating of an optical fiber and for coating removal; a gripping section for gripping the optical fiber; and a slider connecting said main body and said gripping section together so as to be able to approach or separate from each other, wherein: said coating removing device arranged to remove the coating from said optical fiber by separating said main body and said gripping section; said slider includes a retention unit to retain said main body and said gripping section in a maximum separation state; said slider includes a shaft; an end portion of said shaft is fixed to one of said main body or said gripping section; the other of said main body or said gripping section includes a sliding section in which said shaft can slide; and characterized in that said retention unit includes a shaft-side engagement portion that is provided to a terminal end portion of said shaft on an opposite side from the shaft's fixed side and that includes an indentation, and a slide-side engagement portion that is provided to the sliding section and that includes a protrusion (542A, 54A) said retention unit retaining said maximum separation state by said indentation (51 B) and said protrusion (542A,54A) engaging with each other. a main body that includes a blade (21A, 23A) configured for making an incision in a coating of an optical fiber and for coating removal; a gripping section for gripping the optical fiber; and a slider connecting said main body and said gripping section together so as to be able to approach or separate from each other, wherein: said coating removing device arranged to remove the coating from said optical fiber by separating said main body and said gripping section; said slider includes a retention unit to retain said main body and said gripping section in a maximum separation state; said slider includes a shaft; an end portion of said shaft is fixed to one of said main body or said gripping section; the other of said main body or said gripping section includes a sliding section in which said shaft can slide; and characterized in that said retention unit includes a shaft-side engagement portion that is provided to a terminal end portion of said shaft on an opposite side from the shaft's fixed side and that includes an indentation, and a slide-side engagement portion that is provided to the sliding section and that includes a protrusion (542A, 54A) said retention unit retaining said maximum separation state by said indentation (51 B) and said protrusion (542A,54A) engaging with each other. said coating removing device arranged to remove the coating from said optical fiber by separating said main body and said gripping section; said slider includes a retention unit to retain said main body and said gripping section in a maximum separation state; said slider includes a shaft; an end portion of said shaft is fixed to one of said main body or said gripping section; the other of said main body or said gripping section includes a sliding section in which said shaft can slide; and characterized in that said retention unit includes a shaft-side engagement portion that is provided to a terminal end portion of said shaft on an opposite side from the shaft's fixed side and that includes an indentation, and a slide-side engagement portion that is provided to the sliding section and that includes a protrusion (542A, 54A) said retention unit retaining said maximum separation state by said indentation (51 B) and said protrusion (542A,54A) engaging with each other.