To improve degree of freedom of a mounting place of an article and a seat position of personnel by forming a circular arc-shaped installing surface adjusted to curve curvature of a float part in an installing part freely installed in a curved part of the float part, and arranging a fixing means to be fixed to the float part.
A multipurpose simple table 4 being an attachment has a table surface part 4t and a wall surface part 4h crossing at an almost right angle by overhanging toward the circular arc-shaped swelling side from a pair of left/right circular arc-shaped installing parts 4s, and a circular arc-shaped installing surface is formed on the reverse of the installing parts 4s. Both end parts in the curving direction of the installing parts 4s respectively overhang from a root part of the table surface part 4t and the wall surface part 4h to be formed as a locking overhanging part (k) as a fixing means, and the locking overhanging part (k) is freely inserted into inserting belts 7 such as rubberized reinforcing cloth of four places stuck to a boat side float part.
USUI HIROHISA
ACHILLES MARINE KK