The invention relates to the field of inhalation devices for liquids. In particular, the invention relates to a pumping chamber for such an inhalation device. A pumping unit for an inhalation device for medically active liquids for generation of an aerosol comprises a tubular member (1), a check valve (2), and a counter piece, said counter piece being configured to receive at least a downstream segment of said tubular member (1) and having an interior volume, wherein upstream of said tubular member (1), a reservoir (4) can be fluidically connected with said tubular member (1), and downstream of said counter piece, a nozzle unit (6) can be fluidically connected with said counter piece, and wherein the tubular member (1) comprises an upstream section, a downstream section, and the check valve (2) which is positioned between the upstream section and the downstream section, such that a pumping chamber with a pumping chamber volume is defined which comprises the volume of the downstream section of the tubular member (1) and said interior volume of the counter piece, and wherein tubular member (1) and the counter piece can move relatively to one another, such that the pumping chamber volume is variable. The tubular member (1) comprises at least two mechanically distinct parts (1A, 1B), wherein a first part (1A) provides said upstream section, and a second part (1B) provides said downstream section, and the first part (1A) and the second part (1B) are connected to each other such as to form an interface section (1C) serving as a valve chamber (2B) for the valve (2).L'invention relève du domaine des dispositifs d'inhalation de liquides. L'invention concerne en particulier une chambre de pompage pour ledit type de dispositif d'inhalation.L'unité de pompage pour dispositif d'inhalation de principes actifs liquides conçue pour générer un aérosol selon l'invention comprend un élément tubulaire (1), un clapet de non-retour (2), et une contre-pièce, ladite contre-pièce étant co
