A method of manufacturing a scintillator panel, the method comprising: preparing a substrate portion (11, 11A) having a first main surface and a first rear surface intersecting a first direction on sides opposite to each other, and a first side surface extending such that the first main surface and the first rear surface are joined to each other; forming a scintillator layer portion having a second rear surface formed of a plurality of columnar crystals extending in the first direction and formed to include a base portion being on one end side of the columnar crystals and facing the first main surface, a second main surface formed to include a tip portion on the other end side of the columnar crystals, and a second side surface extending such that the second main surface and the second rear surface are joined to each other; forming a first protective film to cover the first rear surface and the first side surface of the substrate portion (11, 11A), and the second main surface and the second side surface of the scintillator layer portion; cutting the first protective film, the substrate portion (11, 11A) and the scintillator layer portion using a cutting tool; and wherein the first side surface partially has a coarse surface, wherein the second side surface has a coarse surface including an uneven structure, wherein the coarse surface of the first side surface and the coarse surface of the second side surface are formed by cutting the substrate portion (11, 11A) and the scintillator layer portion using the cutting tool, forming a second protective film, wherein the second protective film closely adheres to the second side surface such that the coarse surfaces (11d, 12ca) of the first side surface and the second side surface are covered, wherein the scintillator layer portion has an undercut portion having a curved surface shape formed in a corner portion between the second main surface and the second side surface, and wherein the undercut portion is filled with the second protective film. preparing a substrate portion (11, 11A) having a first main surface and a first rear surface intersecting a first direction on sides opposite to each other, and a first side surface extending such that the first main surface and the first rear surface are joined to each other; forming a scintillator layer portion having a second rear surface formed of a plurality of columnar crystals extending in the first direction and formed to include a base portion being on one end side of the columnar crystals and facing the first main surface, a second main surface formed to include a tip portion on the other end side of the columnar crystals, and a second side surface extending such that the second main surface and the second rear surface are joined to each other; forming a first protective film to cover the first rear surface and the first side surface of the substrate portion (11, 11A), and the second main surface and the second side surface of the scintillator layer portion; cutting the first protective film, the substrate portion (11, 11A) and the scintillator layer portion using a cutting tool; and wherein the first side surface partially has a coarse surface, wherein the second side surface has a coarse surface including an uneven structure, wherein the coarse surface of the first side surface and the coarse surface of the second side surface are formed by cutting the substrate portion (11, 11A) and the scintillator layer portion using the cutting tool, wherein the first side surface partially has a coarse surface, wherein the second side surface has a coarse surface including an uneven structure, wherein the coarse surface of the first side surface and the coarse surface of the second side surface are formed by cutting the substrate portion (11, 11A) and the scintillator layer portion using the cutting tool, forming a second protective film, wherein the second protective film closely adheres to the second side surface such that the coarse surfaces (11d, 12ca) of the first side surface and the second side surface are covered, wherein the scintillator layer portion has an undercut portion having a curved surface shape formed in a corner portion between the second main surface and the second side surface, and wherein the undercut portion is filled with the second protective film.