A manufacturing method of a Nd-Fe-B-based rare-earth permanent magnet comprising the steps of: milling magnet material into magnet powder: preparing a mixture by mixing the magnet powder and any one of three kinds of binders • a binder made of a long-chain hydrocarbon or • a binder made of a polymer or a copolymer consisting of one or more kinds of monomers selectable from possible monomers expressed with a general formula R 1 and R 2 represent a hydrogen atom, a lower alkyl group, a phenyl group or a vinyl group or • a binder obtained by mixing the long-chain hydrocarbon and either the polymer or the copolymer; obtaining a green sheet by forming the mixture into a sheet-like shape; decomposing and removing the binder from the green sheet by holding the green sheet for a predetermined length of time at binder decomposition temperature in a non-oxidizing atmosphere; and sintering the green sheet from which the binder has been removed by raising the temperature up to sintering temperature; wherein the mixture is prepared so that the binder is included in an amount of from 2 to 30 wt% with reference to the total weight of the magnet powder and the binder; and wherein a residual oxygen content contained in the permanent magnet after sintering is 2000 ppm or less. milling magnet material into magnet powder: preparing a mixture by mixing the magnet powder and any one of three kinds of binders • a binder made of a long-chain hydrocarbon or • a binder made of a polymer or a copolymer consisting of one or more kinds of monomers selectable from possible monomers expressed with a general formula R 1 and R 2 represent a hydrogen atom, a lower alkyl group, a phenyl group or a vinyl group or • a binder obtained by mixing the long-chain hydrocarbon and either the polymer or the copolymer; obtaining a green sheet by forming the mixture into a sheet-like shape; decomposing and removing the binder from the green sheet by holding the green sheet for a predetermined length of time at binder decomposition temperature in a non-oxidizing atmosphere; and sintering the green sheet from which the binder has been removed by raising the temperature up to sintering temperature; preparing a mixture by mixing the magnet powder and any one of three kinds of binders • a binder made of a long-chain hydrocarbon or • a binder made of a polymer or a copolymer consisting of one or more kinds of monomers selectable from possible monomers expressed with a general formula R 1 and R 2 represent a hydrogen atom, a lower alkyl group, a phenyl group or a vinyl group or • a binder obtained by mixing the long-chain hydrocarbon and either the polymer or the copolymer; • a binder made of a long-chain hydrocarbon or • a binder made of a polymer or a copolymer consisting of one or more kinds of monomers selectable from possible monomers expressed with a general formula R 1 and R 2 represent a hydrogen atom, a lower alkyl group, a phenyl group or a vinyl group or • a binder obtained by mixing the long-chain hydrocarbon and either the polymer or the copolymer; obtaining a green sheet by forming the mixture into a sheet-like shape; decomposing and removing the binder from the green sheet by holding the green sheet for a predetermined length of time at binder decomposition temperature in a non-oxidizing atmosphere; and sintering the green sheet from which the binder has been removed by raising the temperature up to sintering temperature; wherein the mixture is prepared so that the binder is included in an amount of from 2 to 30 wt% with reference to the total weight of the magnet powder and the binder; and wherein a residual oxygen content contained in the permanent magnet after sintering is 2000 ppm or less.