Abstract: A dynamic damper which is reduced in weight and size without impairing the performance of the dynamic damper. A dynamic damper (1) comprising amass member (2) having an inner diameter greater than the outer diameter of a rotating shaft (5) and surrounding the outer periphery of the rotating shaft (5), a holding section (3) located on the inner periphery of the mass member (2) and held by the rotating shaft (5), and elastic sections (4) provided at equal intervals in the circumferential direction and interconnecting the holding section (3) and the mass member (2) to support the mass member (2). The elastic sections (4) are provided tilted in the same direction relative to a line (6) normal to the mass member (2) or the rotating shaft (5).