A hearth roll, comprising: a base roll; a thermally sprayed coating formed on the base roll; and a modified coating formed on the thermally sprayed coating, the modified coating being formed by modifying a part or the whole of a surface of the thermally sprayed coating by melting and solidification of the thermally sprayed coating, by irradiating a part or the whole of the surface of the thermally sprayed coating with an energy beam, a thickness of the modified coating being from 2 to 20 μm, and a Vickers hardness HV of the modified coating being from 1.2 to 1.4 times larger than a Vickers hardness HV of the thermally sprayed coating, wherein the base roll is made of metal, wherein the thermally sprayed coating is a cermet coating consisting of a heat-resistant alloy and a ceramic, the ceramic including, in terms of % by volume, Cr 3 C 2 at from 50% to 90%, Al 2 O 3 at from 1% to 40%,Y 2 O 3 at from 0% to 3%, and ZrB 2 at from 0% to 40%, and the balance being composed of impurities and pores, the heat-resistant alloy including, in terms of % by mass, Cr at from 5% to 20%, Al at from 5% to 20%, at least one of Y or Si at from 0.1% to 6%, and, optionally, at least one of Nb at from 0.1 to 10% or Ti at from 0.1 to 10%, and the balance being composed of at least one of Co or Ni and impurities, and from 50 to 90% by volume of the cermet coating being the ceramic, and the balance being the heat-resistant alloy, wherein Al 2 O 3 is present in a dispersed state in a surface of the modified coating, and a proportion of an area of Al 2 O 3 in the surface of the modified coating is from 5% to 40% and wherein the Vickers hardness HV of the thermally sprayed coating is from 600 to 1,000, and the Vickers hardness HV of the modified coating is from 720 to 1,400. a base roll; a thermally sprayed coating formed on the base roll; and a modified coating formed on the thermally sprayed coating, the modified coating being formed by modifying a part or the whole of a surface of the thermally sprayed coating by melting and solidification of the thermally sprayed coating, by irradiating a part or the whole of the surface of the thermally sprayed coating with an energy beam, a thickness of the modified coating being from 2 to 20 μm, and a Vickers hardness HV of the modified coating being from 1.2 to 1.4 times larger than a Vickers hardness HV of the thermally sprayed coating, wherein the base roll is made of metal, wherein the thermally sprayed coating is a cermet coating consisting of a heat-resistant alloy and a ceramic, the ceramic including, in terms of % by volume, Cr 3 C 2 at from 50% to 90%, Al 2 O 3 at from 1% to 40%,Y 2 O 3 at from 0% to 3%, and ZrB 2 at from 0% to 40%, and the balance being composed of impurities and pores, the heat-resistant alloy including, in terms of % by mass, Cr at from 5% to 20%, Al at from 5% to 20%, at least one of Y or Si at from 0.1% to 6%, and, optionally, at least one of Nb at from 0.1 to 10% or Ti at from 0.1 to 10%, and the balance being composed of at least one of Co or Ni and impurities, and from 50 to 90% by volume of the cermet coating being the ceramic, and the balance being the heat-resistant alloy, wherein Al 2 O 3 is present in a dispersed state in a surface of the modified coating, and a proportion of an area of Al 2 O 3 in the surface of the modified coating is from 5% to 40% and wherein the Vickers hardness HV of the thermally sprayed coating is from 600 to 1,000, and the Vickers hardness HV of the modified coating is from 720 to 1,400.