The invention relates to a fluid filter (1) comprising a collecting chamber (10) for a liquid which is separated from the fluid, in addition to a filter insert (4) which comprises a filter medium (5) which is permeable to the fluid. The collecting chamber is arranged below the filter medium, and a liquid sensor (19) is arranged above the deepest point of the collecting chamber and the liquid sensor is protected from the liquid, at least sectionally, by means of a protective wall (18, 20). Said protective wall extends laterally and/or below the liquid sensor and a liquid permeable connection is provided from the collecting chamber to the fluid sensor. The invention is characterized in that the permeable connection extends in a labyrinth like manner such that the fluid flowing through said connection changes direction a plurality of times, the liquid permeable connection allows the fluid to flow in a radial manner from the collecting chamber, which surrounds the protective wall, to the liquid sensor. Said liquid sensor is separated from the collecting chamber in the radial direction by at least two protective walls (20), wherein in the radially internal protective wall, the closest to the liquid sensor, through openings which are as high as or higher than the liquid sensor are provided, and through openings (25) having the same height or higher than the liquid sensor are provided in at least one protective wall (18) which is arranged in a radial manner further to the outside. The through openings in the at least two protective walls are arranged offset to one other.