PROBLEM TO BE SOLVED: To develop a method for separating a foreign matter attached to a laver net, with which a method for separating a foreign matter of cultured laver is developed, in detail, a foreign matter is not separated from raised laver but the foreign matter is separated from the laver net in the sea before raising. SOLUTION: A foreign matter attached to a laver net is separated by jetting bubbles from below to the laver net in the middle of raising. Further, a foreign matter attached to the laver net is separated by jetting water from below to the laver net in the middle of raising in the sea. Further a foreign matter attached to the laver net is separated by jetting bubbles and water from below to the laver net in the middle of raising in the sea.
