To make a roof of a pier descendable to substantially the vicinity of an upper face of the pier in case of a strong wind by providing a roof over a pier through one or a plurality of posts and making the roof elevatable along the post with a drive means.

In a floating pier, a roof 3 is provided to a pier 1 through one or a plurality of posts 2 and the roof 3 is made elevatable by drive means 4. The pier 1 and a shore Y are connected by a passage X. Drive means 4 is either an electric hydraulic pressure or an electric wire. As a result, during normal times, the roof serves as a shade for passengers getting on and off which provides a better service, and at emergencies such as in case of a typhoon, the roof is descended by drive means to protect the roof from breaking.