A torsional vibration reducing apparatus comprising: a rotating body having a rolling chamber, the rolling chamber being a through-hole that extends through the rotating body in a thickness direction of the rotating body; and a rolling body including a support shaft portion, a first flange portion, a second flange portion, a first corner portion, and a second corner portion, the support shaft portion being housed in the rolling chamber of the rotating body, a length of the support shaft portion in an axial direction being longer than a thickness of the rotating body; the first flange portion and the second flange portion each having a larger outer diameter than an outer diameter of the support shaft portion, the first flange portion being located at one end of the support shaft portion in the axial direction, the second flange portion being located at an other end of the support shaft portion in the axial direction, the first corner portion being defined by the support shaft portion and the first flange portion, the second corner portion being defined by the support shaft portion and the second flange portion, characterized in that sectional shapes of the first corner portion and the second corner portion being different from each other in a section of the rolling body along a central axis of the support shaft portion. a rotating body having a rolling chamber, the rolling chamber being a through-hole that extends through the rotating body in a thickness direction of the rotating body; and the rolling chamber being a through-hole that extends through the rotating body in a thickness direction of the rotating body; and a rolling body including a support shaft portion, a first flange portion, a second flange portion, a first corner portion, and a second corner portion, the support shaft portion being housed in the rolling chamber of the rotating body, a length of the support shaft portion in an axial direction being longer than a thickness of the rotating body; the first flange portion and the second flange portion each having a larger outer diameter than an outer diameter of the support shaft portion, the first flange portion being located at one end of the support shaft portion in the axial direction, the second flange portion being located at an other end of the support shaft portion in the axial direction, the first corner portion being defined by the support shaft portion and the first flange portion, the second corner portion being defined by the support shaft portion and the second flange portion, characterized in that sectional shapes of the first corner portion and the second corner portion being different from each other in a section of the rolling body along a central axis of the support shaft portion. the support shaft portion being housed in the rolling chamber of the rotating body, a length of the support shaft portion in an axial direction being longer than a thickness of the rotating body; the first flange portion and the second flange portion each having a larger outer diameter than an outer diameter of the support shaft portion, the first flange portion being located at one end of the support shaft portion in the axial direction, the second flange portion being located at an other end of the support shaft portion in the axial direction, the first corner portion being defined by the support shaft portion and the first flange portion, the second corner portion being defined by the support shaft portion and the second flange portion, characterized in that sectional shapes of the first corner portion and the second corner portion being different from each other in a section of the rolling body along a central axis of the support shaft portion.