An inhaler type medicine administering device for administering fine granular medicine to the lungs of a patent. The medicine admimistering device comprises a generally cylindrical inhaling piece including a cylindrical holder accommodating section. First and second outside pin insertion holes are formed through the cylindrical wall of the holder accommodating section. A capsule holder is provided to be accommodable within the holder accommodating section of the inhaling piece. The capsule holder is formed with a capsule accommodating hole opened to its end section in which hole a capsule containing medicine is accommodable. First and second inside pin insertion holes are formed extending in the diametrical direction of the capsule holder so as to pass through the capsule accommodating hole. The first inside pin insertion hole is capable of being brought into alignment with the first outside pin insertion hole to form a first pin insertion hole. The second inside pin insertion hole is capable of being brought into alignment with the second outside pin insertion hole to form a second pin insertion hole. An inflow-side passage is located radially outward of the capsule accommodating hole and has a first open end opened at the one end section of the capsule holder, and a second open end connected with the first inside pin insertion hole. An outflow-side passage is located radially outward of the capsule accommodating hole and connects the inside second pin insertion hole to the inhaling opening. Additionally, a perforator is provided including first and second pins which are insertable respectively into the first and second pin insertion holes in order to form holes in the capsule accommodated in the capsule accommodating hole.