PURPOSE: To prevent the feeling of pressing from giving to passengers in a cabin and to facilitate a construction work of a cabin by connecting multiple transparent bodies to a window member for supporting these transparent bodies so as to form the surrounding part of the cabin and installing a roof on the surrounding part.

CONSTITUTION: A cabin 3 is provided with a surrounding part 14 installed erectedly from a deck 2 upward and a roof 15 made of FRP. Also the surrounding part 14 is formed with an aluminum sash, a glass supported by the sash, and a rear door. The sash is formed with the lower frame, vertical frame, upper frame of a window frame member. After the cabin 3 is assembled with these three components, the roof 15 is connected to the surrounding part 14 so as to complete the cabin 3. By connecting the glass to the frames, the surrounding part 14 is formed. Thus trimming work is eliminated, working time is shortened, and work is facilitated. In addition, because the window can be made larger, it can be prevented that it gives a feeling of pressing to passengers in the cabin 3.