To easily and properly press a columnar body and a shock absorbing member to be securely held into a cylindrical member.

After the shock absorbing member 3 is wound around the columnar body 2, the columnar body is arranged with its axis located on a vertical line and the cylindrical member 4 is arranged via a guide tool 6 with its axis located on a vertical line. The cylindrical member is driven relative to the columnar body to get close to each other to press the columnar body and the shock absorbing member into the cylindrical member. At this time, a pressure detecting means PS monitors axial pressure to be imparted to the columnar body and a control means CT controls the drive of the cylindrical member relative to the columnar body in a range between upper and lower limit pressure values in accordance with the detected pressure.