A dynamic damper (1, 60) comprising: a tubular member (10, 61) that has a first end and a second end, the first and second ends (11, 12) being both axial ends; a mass body that is tubular in shape and has an inner peripheral surface, the inner peripheral surface being disposed at a predetermined distance from an outer peripheral surface of the tubular member (10, 61); a protruding section (30, 35, 65, 81) that protrudes from the inner peripheral surface of the mass body, has a leading end (31, 66) opposing the outer peripheral surface of the tubular member (10, 61), and is molded integrally with the mass body; an elastic coupling section (40, 69) that is formed of a rubber elastic body, a fastening member (50, 70) that is inserted into the tubular member (10, 61); and a projecting section (53, 62, 82) that is disposed at the first end and projects outward in an axis-perpendicular direction of the tubular member (10, 61); wherein the protruding section (30, 35, 65, 81) is positioned toward the second end with respect to the projecting section (53, 62, 82); and wherein a part of the projecting section (53, 62, 82) and a part of 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 around the axial center of the tubular member (10, 61) with respect to the tubular member (10, 61), characterized in that the rubber elastic body being adapted to couple the inner peripheral surface of the mass body and the protruding section (30, 35, 65, 81) to the outer peripheral surface of the tubular member (10, 61); the elastic coupling section (40, 69) is vulcanization-bonded to the inner peripheral surface of the mass body, the protruding section (30, 35, 65, 81), and the outer peripheral surface of the tubular member (10, 61), and the fastening member (50, 70) fastens the second end of the tubular member (10, 61) to a target member to fasten the tubular member (10, 61) to the target member. a tubular member (10, 61) that has a first end and a second end, the first and second ends (11, 12) being both axial ends; a mass body that is tubular in shape and has an inner peripheral surface, the inner peripheral surface being disposed at a predetermined distance from an outer peripheral surface of the tubular member (10, 61); a protruding section (30, 35, 65, 81) that protrudes from the inner peripheral surface of the mass body, has a leading end (31, 66) opposing the outer peripheral surface of the tubular member (10, 61), and is molded integrally with the mass body; an elastic coupling section (40, 69) that is formed of a rubber elastic body, a fastening member (50, 70) that is inserted into the tubular member (10, 61); and a projecting section (53, 62, 82) that is disposed at the first end and projects outward in an axis-perpendicular direction of the tubular member (10, 61); wherein the protruding section (30, 35, 65, 81) is positioned toward the second end with respect to the projecting section (53, 62, 82); and wherein a part of the projecting section (53, 62, 82) and a part of 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 around the axial center of the tubular member (10, 61) with respect to the tubular member (10, 61), characterized in that the rubber elastic body being adapted to couple the inner peripheral surface of the mass body and the protruding section (30, 35, 65, 81) to the outer peripheral surface of the tubular member (10, 61); the elastic coupling section (40, 69) is vulcanization-bonded to the inner peripheral surface of the mass body, the protruding section (30, 35, 65, 81), and the outer peripheral surface of the tubular member (10, 61), and the fastening member (50, 70) fastens the second end of the tubular member (10, 61) to a target member to fasten the tubular member (10, 61) to the target member.