The invention relates first of all to an inhaler (1) for powderedsubstances, in particular medical substances, comprising a suction air channel(6)leading to a mouthpiece (4), further comprises a substance supply container(8)that is preferred to be moveable inside a receiving chamber (7) and a sievepart(9) disposed in the suction air channel (6) between the receiving chamber (7)andthe mouthpiece (4), said sieve part comprising a retaining edge (10) and asievearea contained in a cross sectional area within the retaining edge (10),whereinthe sieve area has a protruding area (12) that protrudes to one side and has aflatportion (13).
