An inhaler device for facilitating the inhalation of a medicament from a pierceable medicament capsule, the inhaler device comprising a body (1) having a chamber (14) for receiving a pierceable medicament capsule； piercing means (7) for piercing a medicament capsule received in said chamber (14)； and an actuating member (3) moveable relative to the body (1)； characterised by a plurality of cam members (180,190) and a cam track, wherein one movement of the actuating member (3) relative to the body (1) causes one (180) of said cam members to move along the cam track (230) in abutment therewith, the piercing means (7) thereby being pressed from a retracted position to an extended position； wherein another movement of the actuating member (3) relative to the body (1) causes the other one (190) of said cam members to move along the cam track (330) in abutment therewith so that the piercing means (7) is pressed from an extended position towards a retracted position. (Figure 6c)
