Abstract: The invention relates to an underwater cleaner (1), particularly for a swimming pool, comprising a suction nozzle housing (3) that has a suction nozzle (2), which communicates with a suction chamber (4), and has a suction mouth (19), which defines a suction plane (16), whereby a discharge channel (5) emanates from the suction chamber (4), and a filter device (6) is connected to said outlet channel. The inventive device also comprises a water jet nozzle (7) that leads into the suction chamber (4) and via which water under pressure can be fed into the suction chamber (4) whereby, according to the principle of the water jet pump, giving rise to a vacuum inside the suction chamber (4). The aim of the invention is, in the simplest possible manner and even in difficult to reach areas, to enable an effective cleaning and, at the same time, to also efficiently remove heavy dirt particles, such as stones.