PURPOSE: To facilitate the interior finish work in a cabin by providing a baggage compartment under the stepped part of the front end of a cabinroof.

CONSTITUTION: A front wall 5 of the cabin 3 is located at the position at the rear of the stepped part 8 of the front end of the cabinroof 7, and the baggage compartment 6 is formed in front of the cabin 3. Since the interior finish work is not needed for the stepped part 8, the work becomes easy. Since the front of the cabin can be utilized as the baggage compartment, the space in the hull can be effectively used.