A middle/high carbon steel sheet, wherein composition thereof consists of, by mass%: C: 0.10% to 1.50%, Si: 0.01% to 1.00%, Mn: 0.01% to 3.00%, P: 0.0001% to 0.1000%, S: 0.0001% to 0.1000%, optionally one or more selected from the group consisting of Al: 0.001% to 0.500%, N: 0.0001% to 0.0500%, O: 0.0001% to 0.0500%, Cr: 0.001% to 2.000%, Mo: 0.001% to 2.000%, Ni: 0.001% to 2.000%, Cu: 0.001% to 1.000%, Nb: 0.001% to 1.000%, V: 0.001% to 1.000%, Ti: 0.001% to 1.000%, B: 0.0001% to 0.0500%, W: 0.001% to 1.000%, Ta: 0.001% to 1.000%, Sn: 0.001% to 0.020%, Sb: 0.001% to 0.020%, As: 0.001% to 0.020%, Mg: 0.0001% to 0.0200%, Ca: 0.001% to 0.020%, Y: 0.001% to 0.020%, Zr: 0.001% to 0.020%, La: 0.001% to 0.020%, and Ce: 0.001% to 0.020%, and a remainder of Fe and impurities, wherein the steel sheet has a structure in which a total volume percentage of a martensite, a bainite, a pearlite, and a residual austenite is equal to or lower than 5.0%, and a remainder thereof is a ferrite and carbides, wherein a spheroidizing ratio of carbide particles is 70% to 99%, wherein a proportion of a number of the carbide particles including a crystal interface at which an orientation difference is equal to or greater than 5° in the carbide particles is equal to or lower than 20% of a total number of the carbide particles, wherein a grain size of the ferrite is 5 to 60 μm, and wherein the spheroidizing ratio of the carbide is a value obtained by dividing the number of spherical carbides, which are carbides having a ratio of a long-axis length to a short-axis length of smaller than 3, by the number of all carbides. C: 0.10% to 1.50%, Si: 0.01% to 1.00%, Mn: 0.01% to 3.00%, P: 0.0001% to 0.1000%, S: 0.0001% to 0.1000%, optionally one or more selected from the group consisting of Al: 0.001% to 0.500%, N: 0.0001% to 0.0500%, O: 0.0001% to 0.0500%, Cr: 0.001% to 2.000%, Mo: 0.001% to 2.000%, Ni: 0.001% to 2.000%, Cu: 0.001% to 1.000%, Nb: 0.001% to 1.000%, V: 0.001% to 1.000%, Ti: 0.001% to 1.000%, B: 0.0001% to 0.0500%, W: 0.001% to 1.000%, Ta: 0.001% to 1.000%, Sn: 0.001% to 0.020%, Sb: 0.001% to 0.020%, As: 0.001% to 0.020%, Mg: 0.0001% to 0.0200%, Ca: 0.001% to 0.020%, Y: 0.001% to 0.020%, Zr: 0.001% to 0.020%, La: 0.001% to 0.020%, and Ce: 0.001% to 0.020%, and Al: 0.001% to 0.500%, N: 0.0001% to 0.0500%, O: 0.0001% to 0.0500%, Cr: 0.001% to 2.000%, Mo: 0.001% to 2.000%, Ni: 0.001% to 2.000%, Cu: 0.001% to 1.000%, Nb: 0.001% to 1.000%, V: 0.001% to 1.000%, Ti: 0.001% to 1.000%, B: 0.0001% to 0.0500%, W: 0.001% to 1.000%, Ta: 0.001% to 1.000%, Sn: 0.001% to 0.020%, Sb: 0.001% to 0.020%, As: 0.001% to 0.020%, Mg: 0.0001% to 0.0200%, Ca: 0.001% to 0.020%, Y: 0.001% to 0.020%, Zr: 0.001% to 0.020%, La: 0.001% to 0.020%, and Ce: 0.001% to 0.020%, and a remainder of Fe and impurities, wherein the steel sheet has a structure in which a total volume percentage of a martensite, a bainite, a pearlite, and a residual austenite is equal to or lower than 5.0%, and a remainder thereof is a ferrite and carbides, wherein a spheroidizing ratio of carbide particles is 70% to 99%, wherein a proportion of a number of the carbide particles including a crystal interface at which an orientation difference is equal to or greater than 5° in the carbide particles is equal to or lower than 20% of a total number of the carbide particles, wherein a grain size of the ferrite is 5 to 60 μm, and wherein the spheroidizing ratio of the carbide is a value obtained by dividing the number of spherical carbides, which are carbides having a ratio of a long-axis length to a short-axis length of smaller than 3, by the number of all carbides.