A dynamic damper has a main body, two mass portions projecting from the main body in diametrical directions of a drive shaft, and two connecting portions connecting the main body and the respective mass portions to each other. The connecting portions are narrower than the mass portions. The mass portions accommodate mass members therein, respectively. Each of the mass members comprises a sintered body produced by sintering a powder of a tungsten alloy or tungsten mixed with a metal binder. The tungsten alloy may be W-1.8Ni-1.2Cu, W-3.0Ni-2.0Cu, W-5.0Ni-2.0Fe, or W-3.5Ni-1.5Fe.