An oriented magnetic steel plate is provided with a steel plate having a steel-plate surface in which a groove is formed, the groove extending in a direction that intersects the rolling direction, and the groove-depth direction coinciding with the plate-thickness direction, wherein: the average depth D of the groove is greater than 10 micrometers and no more than 40 micrometers; and when the groove is viewed in a groove-width-direction cross-section orthogonal to the direction in which the groove extends, the deepest part of the groove deviates to the groove-width direction side from the groove-width center, and the cross-sectional shape of the groove is asymmetrical in the groove-width direction with respect to the groove-width center, where the width-direction center of the groove is defined as the groove-width center.