the hollow shaft 2 easily and fixed thereto stably second embodiment fig4 a and 4b fig5 a to 5e a dynamic damper 100 of a second embodiment is different from the dynamic damper 10 of the first embodiment in that the front end pressure contact face 21 a of each convex portion 21 of the outer pipe 20 engages a concave engaging portion 42 with a predetermined depth which is provided on the outer periphery 41 of the elastic body 40 so as to nip and hold the outer peripheral portion 41 a between the front end pressure contact faces 21 a of the adjacent convex portions 21 the manufacturing procedure for the dynamic damper 100 is as follows fig5 a to 5e 1 the tube like elastic body 40 a which is raw material of the annular elastic body 40 is formed separately fig5 a the tube like elastic body 40 a contains the concave grooves 42 a which constitute the concave engaging portions 42 at plural positions five positions in this embodiment along the circumferential direction then the tube like elastic body 40 a is cut to necessary lengths so as to form the annular elastic bodies 40 fig5 b 2 the weight 30 is fitted into the inner periphery of the elastic body 40 fig5 c 5 d the inner peripheral portion of the elastic body 40 is fitted in the annular groove 31 in the weight 30 3 the outer pipe 20 is fitted on the outer periphery of the elastic body 40 fig5 e the front end pressure contact face 21 a of the convex portion 21 of the outer pipe 20 is fitted in the concave engaging portion 42 in the elastic body 40 4 an assembly obtained by.