An inhaler (1) includes a sieve part (9) for administrating powdered substances such as medical substances. The inhaler (1) includes a suction air channel (6) leading to a mouthpiece (4), a substance supply container (8) that is moveable inside a receiving chamber (7) and the sieve part (9) disposed in the suction air channel (6) between the receiving chamber (7) and the mouthpiece (4). The sieve part includes a retaining edge (10), a sieve area contained in a cross sectional area within the retaining edge (10), and a protruding area (12) that protrudes to one side and has a flat portion (13).
