To reduce cost by easily fixedly inserting block bodies such as cam blocks and the inner ring of a rolling bearing onto the outer diameter surface of a hollow shaft in the axial direction.

The block bodies 14 and the inner ring 32 of the rolling bearing 31 are disposed onto the outer diameter surface of the hollow shaft 12 in the axial direction at predetermined intervals. While the outer diameter surface of the hollow shaft 12 is elastically deformed in the diameter increasing direction and press-fitted onto the inner diameter surfaces of the block bodies 14 and the inner diameter surface of the inner ring 32 of the rolling bearing 31, the block bodies 14 and the inner ring 32 of the rolling bearing 31 are fixed to the outer diameter surface of the hollow shaft 12.