A dynamic damper (1, 60) includes a tubular member (10, 61), a mass body (20), a protruding section (30, 35, 65, 81), an elastic coupling section (40, 69), a fastening member (50, 70), and a projecting section (53, 62, 82). The protruding section (30, 35, 65, 81) is positioned toward the second end (12) of the tubular member (10, 61) with respect to the projecting section (53, 62, 82). The projecting section (53, 62, 82) and the protruding section (30, 35, 65, 81) overlap in the axial direction of the tubular member (10, 61) at any position reached by relatively rotating the mass body (20) around the axial center (A) of the tubular member (10, 61) with respect to the tubular member (10, 61).