A grain-oriented electrical steel sheet that has a base steel sheet, and a steel sheet surface provided with grooves , comprising: a surface protrusion that protrudes from the steel sheet surface in a region expanding outward in a width direction of the groove from a widthwise end portion of the groove, the surface protrusion extending along a longitudinal direction of the groove, wherein an average protrusion height of the surface protrusion is more than 5 μm and not more than 10 μm, when the surface protrusion is viewed in a cross section including the longitudinal direction of the groove and a normal direction of the steel sheet surface, the surface protrusion includes specific portions each having a height of 50% or more with respect to a height of each peak point (P1, P2, P3, P4, P5) appearing on a profile line of the surface protrusion , and in the longitudinal direction of the groove, a total length (Lsum) of the specific portions is a length of 30% or more with respect to an overall length (L) of the surface protrusion , the base steel sheet contains as a chemical composition, by mass%, Si: 0.8% to 7%, C: more than 0% and equal to or less than 0.085%, acid-soluble Al: 0% to 0.065%, N: 0% to 0.012%, Mn: 0% to 1%, Cr: 0% to 0.3%, Cu: 0% to 0.4%, P: 0% to 0.5%, Sn: 0% to 0.3%, Sb: 0% to 0.3%, Ni: 0% to 1%, S: 0% to 0.015%, Se: 0% to 0.015%, and a remainder consisting of Fe and impurities, an average groove depth of the grain-oriented electrical steel sheet is 8 to 30 μm, and, an average groove width of the grain-oriented electrical steel sheet is 1 to 200 μm, wherein the average protrusion height of the surface protrusion, the average groove depth, and the average groove width are measured with the methods according to the description. a surface protrusion that protrudes from the steel sheet surface in a region expanding outward in a width direction of the groove from a widthwise end portion of the groove, the surface protrusion extending along a longitudinal direction of the groove, wherein an average protrusion height of the surface protrusion is more than 5 μm and not more than 10 μm, when the surface protrusion is viewed in a cross section including the longitudinal direction of the groove and a normal direction of the steel sheet surface, the surface protrusion includes specific portions each having a height of 50% or more with respect to a height of each peak point (P1, P2, P3, P4, P5) appearing on a profile line of the surface protrusion , and in the longitudinal direction of the groove, a total length (Lsum) of the specific portions is a length of 30% or more with respect to an overall length (L) of the surface protrusion , the base steel sheet contains as a chemical composition, by mass%, Si: 0.8% to 7%, C: more than 0% and equal to or less than 0.085%, acid-soluble Al: 0% to 0.065%, N: 0% to 0.012%, Mn: 0% to 1%, Cr: 0% to 0.3%, Cu: 0% to 0.4%, P: 0% to 0.5%, Sn: 0% to 0.3%, Sb: 0% to 0.3%, Ni: 0% to 1%, S: 0% to 0.015%, Se: 0% to 0.015%, and a remainder consisting of Fe and impurities, an average groove depth of the grain-oriented electrical steel sheet is 8 to 30 μm, and, an average groove width of the grain-oriented electrical steel sheet is 1 to 200 μm, wherein the average protrusion height of the surface protrusion, the average groove depth, and the average groove width are measured with the methods according to the description. <EOS>