PURPOSE: To increase the utilization efficiency of the space inside a cabin by forming boards on both sides in a cabin and constituting the whole in flat plane by setting sheets on the boards and between the boards and arranging a galley box shiftingly on one board.

CONSTITUTION: Boards 60 are formed along the both sides of the floor 13 in a cabin 10, and rails 7 and 7' are laid on one board 60, and a galley box 4 is arranged shiftingly. The galley box 4 is constituted of a box form having an opening and closing cover in the upper part and a range is freely accomodated inside. Sofas 6 are installed on the board 60, and a table 5 is installed as a substitute for the sofa 6 on a part of the board. The legs 51 of the table 5 is constituted detachably. When the table 5 is installd at a high position and the top plate is extended on the floor 13, the table is set on the same plane to the galley box 4 and serves as a cooking board. When the table is folded up with the hinge part 52, the table can be used as a common table.