A grain-oriented electrical steel sheet , comprising: a steel sheet having a steel sheet surface in which a groove , which extends in a direction intersecting a rolling direction (X) and of which a groove depth direction becomes a sheet thickness direction (Z), is formed, wherein an average depth D of the groove is greater than 10 μm and equal to or less than 40 μm, in a case where the groove is seen on a groove-width-direction cross-section that is perpendicular to a groove extension direction, when a center of the groove in the groove width direction is defined as a groove width center (GC), a deepest portion of the groove deviates from the groove width center toward one side in the groove width direction, and a cross-sectional shape of the groove is asymmetric with respect to the groove width center as a reference in the groove width direction, in a case where the groove is seen on the groove-width-direction cross-section, the groove includes a first groove surface and a second groove surface as a pair of inclined surfaces which are inclined toward the deepest portion of the groove from the steel sheet surface, and the groove width center is located on a second groove surface side when seen from the deepest portion, and when an angle, which is made by a first groove end straight line (Lb1) obtained through linear approximation of the first groove surface and the sheet thickness direction, is defined as a first angle θ1, and an angle, which is made by a second groove end straight line (Lb2) obtained through linear approximation of the second groove surface and the sheet thickness direction, is defined as a second angle θ2, the first angle θ1 and the second angle θ2 satisfy following Conditional Expressions to . 0 ° ≤ θ 1 ≤ 50 ° θ 1 < θ 2 ≤ 75 ° θ 2 − θ 1 ≥ 10 ° a steel sheet having a steel sheet surface in which a groove , which extends in a direction intersecting a rolling direction (X) and of which a groove depth direction becomes a sheet thickness direction (Z), is formed, wherein an average depth D of the groove is greater than 10 μm and equal to or less than 40 μm, in a case where the groove is seen on a groove-width-direction cross-section that is perpendicular to a groove extension direction, when a center of the groove in the groove width direction is defined as a groove width center (GC), a deepest portion of the groove deviates from the groove width center toward one side in the groove width direction, and a cross-sectional shape of the groove is asymmetric with respect to the groove width center as a reference in the groove width direction, in a case where the groove is seen on the groove-width-direction cross-section, the groove includes a first groove surface and a second groove surface as a pair of inclined surfaces which are inclined toward the deepest portion of the groove from the steel sheet surface, and the groove width center is located on a second groove surface side when seen from the deepest portion, and when an angle, which is made by a first groove end straight line (Lb1) obtained through linear approximation of the first groove surface and the sheet thickness direction, is defined as a first angle θ1, and an angle, which is made by a second groove end straight line (Lb2) obtained through linear approximation of the second groove surface and the sheet thickness direction, is defined as a second angle θ2, the first angle θ1 and the second angle θ2 satisfy following Conditional Expressions to . 0 ° ≤ θ 1 ≤ 50 ° θ 1 < θ 2 ≤ 75 ° θ 2 − θ 1 ≥ 10 ° <EOS>