PURPOSE: To prevent the hindrance of the maintenance and inspection works of an outboard engine by a laver net even in the case of returning the laver net to the sea from the stern.

CONSTITUTION: The rear end of a guide 4 for a laver net is extended from the rear end of a tilt-up outboard engine 7 to the backside the boat. The laver net N is transferred above the outboard engine 7 and returned through the rear end of the tilt-up outboard engine 7 and the rear end of the boat to the sea. The maintenance and inspection of the outboard engine 7 can be performed without being hindered with the laver net N during the reaping work of laver or the acid-treatment work of the laver net.