A producing method for a coke comprising the steps of evaluating a coal used as a raw material for coke, the coal to be evaluated having a Gieseler maximum fluidity MF of 20 ddpm or less before the amine is added to the coal, characterized by the method comprising: using a Gieseler maximum fluidity MF of a coal as an index for evaluating the coal, wherein a primary or secondary amine including an aromatic ring, which is capable of enhancing the fluidity of a coal when added to the coal in such a coal fluidity enhancing amount, have been added to the coal, thereby enhancing the thermoplasticity of the coal, wherein the Gieseler maximum fluidity MF of each coal of plural brands of coals have already been measured; and a plurality of coke drum strength differences have already been measured, each of the plurality of coke drum strength differences being measured for a coke produced by carbonization of a coal blend including the each coal of which the Gieseler maximum fluidity MF has already been measured in a carbonization condition where a fixed amount of each coal is included in the coal blend, wherein the residual coal in the coal blend is the same or wherein the average quality of the coal blend is adjusted to a target quality and for a coke produced by carbonization of a coal blend without including each coal; the method further comprising the steps of: determining a Gieseler maximum fluidity MF corresponding to a target value of coke drum strength differences from a relational formula between the measured Gieseler maximum fluidity MF and the plurality of the coke drum strength differences corresponding to each of the measured Gieseler maximum fluidity MF; evaluating a coal of which a Gieseler maximum fluidity MF from measurement is equal to or larger than the determined Gieseler maximum fluidity MF as being usable for a raw material for coke, and carbonizing a coal blend including the evaluated coal, to produce a coke, if the coal is evaluated as being usable for a raw material for coke. using a Gieseler maximum fluidity MF of a coal as an index for evaluating the coal, wherein a primary or secondary amine including an aromatic ring, which is capable of enhancing the fluidity of a coal when added to the coal in such a coal fluidity enhancing amount, have been added to the coal, thereby enhancing the thermoplasticity of the coal, wherein the Gieseler maximum fluidity MF of each coal of plural brands of coals have already been measured; and a plurality of coke drum strength differences have already been measured, each of the plurality of coke drum strength differences being measured for a coke produced by carbonization of a coal blend including the each coal of which the Gieseler maximum fluidity MF has already been measured in a carbonization condition where a fixed amount of each coal is included in the coal blend, wherein the residual coal in the coal blend is the same or wherein the average quality of the coal blend is adjusted to a target quality and for a coke produced by carbonization of a coal blend without including each coal; the method further comprising the steps of: determining a Gieseler maximum fluidity MF corresponding to a target value of coke drum strength differences from a relational formula between the measured Gieseler maximum fluidity MF and the plurality of the coke drum strength differences corresponding to each of the measured Gieseler maximum fluidity MF; evaluating a coal of which a Gieseler maximum fluidity MF from measurement is equal to or larger than the determined Gieseler maximum fluidity MF as being usable for a raw material for coke, and carbonizing a coal blend including the evaluated coal, to produce a coke, if the coal is evaluated as being usable for a raw material for coke. determining a Gieseler maximum fluidity MF corresponding to a target value of coke drum strength differences from a relational formula between the measured Gieseler maximum fluidity MF and the plurality of the coke drum strength differences corresponding to each of the measured Gieseler maximum fluidity MF; evaluating a coal of which a Gieseler maximum fluidity MF from measurement is equal to or larger than the determined Gieseler maximum fluidity MF as being usable for a raw material for coke, and carbonizing a coal blend including the evaluated coal, to produce a coke, if the coal is evaluated as being usable for a raw material for coke.