A method of lifting a nacelle installed on a tower, comprising: attaching a tapered bushing mechanism to a through-hole provided for a member of said tower; attaching a push-up bolt to said tapered bushing mechanism; and raising said push-up bolt while pushing said push-up bolt against a first member provided for said nacelle, wherein said tapered bushing mechanism comprises a tapered bushing inner cylinder and a tapered bushing outer cylinder, wherein said tapered bushing inner cylinder comprises a first end and a first taper section whose outer diameter becomes larger toward said first end of said tapered bushing inner cylinder and a first screw thread formed on an inner surface of said tapered bushing inner cylinder, wherein said tapered bushing outer cylinder comprises a second end and a second taper section whose inner diameter becomes smaller toward said second end of said tapered bushing outer cylinder, wherein said attaching of said tapered bushing mechanism to said through-hole comprises: inserting said tapered bushing mechanism in said through-hole such that the first end of said tapered bushing inner cylinder is positioned up while the second end of said tapered bushing outer cylinder is positioned down, an outer circumferential surface of said first taper section and an inner surface of said second taper section being in contact with each other, and an outer circumferential surface of said tapered bushing outer cylinder being in contact with said through-hole; and pulling down said tapered bushing inner cylinder in a state that said tapered bushing mechanism has been inserted in said through-hole, and wherein said raising of said push-up bolt comprises turning said push-up bolt in a state that said push-up bolt has been engaged with said first screw thread. attaching a tapered bushing mechanism to a through-hole provided for a member of said tower; attaching a push-up bolt to said tapered bushing mechanism; and raising said push-up bolt while pushing said push-up bolt against a first member provided for said nacelle, wherein said tapered bushing mechanism comprises a tapered bushing inner cylinder and a tapered bushing outer cylinder, wherein said tapered bushing inner cylinder comprises a first end and a first taper section whose outer diameter becomes larger toward said first end of said tapered bushing inner cylinder and a first screw thread formed on an inner surface of said tapered bushing inner cylinder, wherein said tapered bushing outer cylinder comprises a second end and a second taper section whose inner diameter becomes smaller toward said second end of said tapered bushing outer cylinder, wherein said attaching of said tapered bushing mechanism to said through-hole comprises: inserting said tapered bushing mechanism in said through-hole such that the first end of said tapered bushing inner cylinder is positioned up while the second end of said tapered bushing outer cylinder is positioned down, an outer circumferential surface of said first taper section and an inner surface of said second taper section being in contact with each other, and an outer circumferential surface of said tapered bushing outer cylinder being in contact with said through-hole; and pulling down said tapered bushing inner cylinder in a state that said tapered bushing mechanism has been inserted in said through-hole, and wherein said raising of said push-up bolt comprises turning said push-up bolt in a state that said push-up bolt has been engaged with said first screw thread. inserting said tapered bushing mechanism in said through-hole such that the first end of said tapered bushing inner cylinder is positioned up while the second end of said tapered bushing outer cylinder is positioned down, an outer circumferential surface of said first taper section and an inner surface of said second taper section being in contact with each other, and an outer circumferential surface of said tapered bushing outer cylinder being in contact with said through-hole; and pulling down said tapered bushing inner cylinder in a state that said tapered bushing mechanism has been inserted in said through-hole, and wherein said raising of said push-up bolt comprises turning said push-up bolt in a state that said push-up bolt has been engaged with said first screw thread.