A method for manufacturing a coal mixture, the method comprising the steps of: preparing a large-permeation-distance coal and a permeation-distance-decreasing coal, mixing the large-permeation-distance coal and the permeation-distance-decreasing coal so that the mass fraction of the permeation-distance-decreasing coal is in a range derived by multiplying the mass fraction of the large-permeation-distance coal by 0.25 or more and 3.0 or less, wherein the content of the large-permeation-distance coal is 30 mass% or less, the permeation-distance-decreasing coal has a mean maximum vitrinite reflectance Ro of 1.25% or more and a total inert amount TI of 30 vol.% or less, a permeation distance (mm) which is determined by following steps of: placing a material having through-holes penetrating from upper surface to lower surface of the material on the top of a coal sample packed in a container; heating the coal sample to permeate into the through-holes; and determining a distance over which the coal permeates into the through-holes as the permeation distance (mm); and the large-permeation-distance coal has the permeation distance (mm) which is more than a value of the criteria permeation distance derived by using following equation: criteria permeation distance = 1.3 × a × logMF where MF is the Gieseler maximum fluidity (ddpm) of coal and a is a constant defined as a coefficient of the common logarithm logMF of Gieseler maximum fluidity MF multiplied by a value in the range of 0.7 or more and 1.0 or less, when a regression line that passes through the origin is drawn based on data sets of the determined value of permeation distance (mm) and logMF of at least one of coal brands having a logMF of less than 2.5. preparing a large-permeation-distance coal and a permeation-distance-decreasing coal, mixing the large-permeation-distance coal and the permeation-distance-decreasing coal so that the mass fraction of the permeation-distance-decreasing coal is in a range derived by multiplying the mass fraction of the large-permeation-distance coal by 0.25 or more and 3.0 or less, wherein the content of the large-permeation-distance coal is 30 mass% or less, the permeation-distance-decreasing coal has a mean maximum vitrinite reflectance Ro of 1.25% or more and a total inert amount TI of 30 vol.% or less, a permeation distance (mm) which is determined by following steps of: placing a material having through-holes penetrating from upper surface to lower surface of the material on the top of a coal sample packed in a container; heating the coal sample to permeate into the through-holes; and determining a distance over which the coal permeates into the through-holes as the permeation distance (mm); and placing a material having through-holes penetrating from upper surface to lower surface of the material on the top of a coal sample packed in a container; heating the coal sample to permeate into the through-holes; and determining a distance over which the coal permeates into the through-holes as the permeation distance (mm); and the large-permeation-distance coal has the permeation distance (mm) which is more than a value of the criteria permeation distance derived by using following equation: criteria permeation distance = 1.3 × a × logMF where MF is the Gieseler maximum fluidity (ddpm) of coal and a is a constant defined as a coefficient of the common logarithm logMF of Gieseler maximum fluidity MF multiplied by a value in the range of 0.7 or more and 1.0 or less, when a regression line that passes through the origin is drawn based on data sets of the determined value of permeation distance (mm) and logMF of at least one of coal brands having a logMF of less than 2.5. where MF is the Gieseler maximum fluidity (ddpm) of coal and a is a constant defined as a coefficient of the common logarithm logMF of Gieseler maximum fluidity MF multiplied by a value in the range of 0.7 or more and 1.0 or less, when a regression line that passes through the origin is drawn based on data sets of the determined value of permeation distance (mm) and logMF of at least one of coal brands having a logMF of less than 2.5.