The present invention relates to a beard trimmer having one or more rotary heads (1), said rotary cutting heads having a moving blade (2) and a fixed blade (3), each head being surrounded by a crown-shaped comb (4), said comb being adjustable in height in order to adjust, in use, the distance between said blades and the skin, and thereby to adapt the cutting of the beard to the desired length, characterized in that the trimmer comprises a fixed bade having a shape characterized by: —a tooth length L3 of 1 to 3 mm, preferably 1.5 to 2 mm; —an opening angle between the teeth of 20 to 30°, preferably 22 to 28°, and more preferably 24 and 27°; —a tooth width L2, at the end of the teeth, of 0.3 to 1 mm, preferably 0.4 to 0.9 mm.