A kind of introscope rocking bar waterproof construction includes: a substrate is equipped with a framework. One elastic cuff has one first wall portion, and elastic cuff is set on what substrate and the first wall portion is sandwiched between what framework and substrate. One screw rod has a baffle portion, and screw rod wears the opening of what elastic cuff with one end, then to allow screw rod to fix what elastic cuff on the sealed what screw rod of a closure.一種內視鏡搖桿防水結構包含有：一基板，上設有一框體。一彈性封套，具有一第一垣部，彈性封套設於基板上並且第一垣部被夾設於框體與基板之間。一螺桿，具有一擋板部，螺桿以一端穿設於彈性封套的開口，再以一鎖合件鎖合於螺桿上，使螺桿可以固定於彈性封套。
