A tire having: a tread with stud holes for stud insertion on the surface side thereof, wherein, when studs are not inserted into the stud holes , the stud holes each have an opening side part on one side along the central axis thereof, which opens on the surface of the tread , and a bottom side part on the other side along the central axis thereof, wherein an inner peripheral surface of the bottom side part is formed in a curved surface swelling outward away from the central axis of the stud hole , wherein the maximum diameter position of the inner peripheral surface of the bottom side part is located on the hole bottom surface side of the intermediate position between the boundary position of the opening side part and the bottom side part and the hole bottom surface , wherein the curvature radius (R1) of a curved surface on the opening side, which is a curved surface extending along the central axis of the stud hole positioned between the maximum diameter position and the boundary position is greater than the curvature radius (R2) of a curved surface on the bottom side, which is a curved surface extending along the central axis of the stud hole positioned between the maximum diameter position and the hole bottom surface of the stud hole , characterised in that : the opening side part has an opening area formed in an inverted cone shape whose diameter reduces gradually from the surface side of the tread toward the hole bottom surface of the stud hole and the opening diameter of the opening of the opening area is larger than the cross-sectional diameter of the bottom side part . a tread with stud holes for stud insertion on the surface side thereof, wherein, when studs are not inserted into the stud holes , the stud holes each have an opening side part on one side along the central axis thereof, which opens on the surface of the tread , and a bottom side part on the other side along the central axis thereof, wherein an inner peripheral surface of the bottom side part is formed in a curved surface swelling outward away from the central axis of the stud hole , wherein the maximum diameter position of the inner peripheral surface of the bottom side part is located on the hole bottom surface side of the intermediate position between the boundary position of the opening side part and the bottom side part and the hole bottom surface , wherein the curvature radius (R1) of a curved surface on the opening side, which is a curved surface extending along the central axis of the stud hole positioned between the maximum diameter position and the boundary position is greater than the curvature radius (R2) of a curved surface on the bottom side, which is a curved surface extending along the central axis of the stud hole positioned between the maximum diameter position and the hole bottom surface of the stud hole , characterised in that : the opening side part has an opening area formed in an inverted cone shape whose diameter reduces gradually from the surface side of the tread toward the hole bottom surface of the stud hole and the opening diameter of the opening of the opening area is larger than the cross-sectional diameter of the bottom side part . <EOS>