The present invention relates to a golf ball. At all points Pa included in zone ''A'' away from the central point of the core 4 at a distance of 1 mm or greater and less than 5 mm, the following mathematical expression (I): Ha2-Ha1<5, is satisfied, and at any point Pb included in zone ''B'' away from the central point of the core 4 at a distance of 5 mm or greater and 10 mm or less, the followingmathematical expression (II): Hb2-Hb1>5 or Hb2-Hb1=5, is satisfied. Ha1 represents the hardness at a point Pa1 that is located inside the point Pa along the radial direction and away from the point Pa at a distance of 1 mm, and Ha2 represents the hardness at a point Pa2 that is located outside the point Pa along the radial direction and away from the point Pa at a distance of 1 mm. Hb1 representsthe hardness at a point Pb1 that is located inside the point Pb along the radial direction and away from the point Pb at a distance of 1 mm, and Hb2 represents the hardness at a point Pb2 that is located outside the point Pb along the radial direction and away from the point Pb at a distance of 1 mm.