An actuator for an inhaler for delivering medicament by inhalation, comprising: a main body comprising a tubular member for receiving a canister containing medicament and having a valve stem extending therefrom； and an outlet assembly, as a part formed separately of the main body, comprising a mouthpiece for guiding medicament to the mouth of a user and a nozzle block for receiving the valve stem of the canister and delivering medicament from the canister into the mouthpiece； wherein the main body is provided with an outlet opening for receiving the outlet assembly in a position wherein the mouthpiece extends outside the outlet opening and the nozzle block is inserted through the outlet opening and arranged in position for receiving the valve stem of the canister. There is also disclosed an inhaler comprising the above-described actuator and a canister containing medicament, a main body and an outlet assembly.
