The present invention relates to a medicament delivery device (10, 110) comprising a medicament receiving element (14), at least one fluid chamber (16) having a fluid outlet (29b) configured to direct fluid vapour towards the medicament receiving element (14), a heating element (30) for heating the fluid in the at least one fluid chamber (16). The device (10) is configured such that, in use, the heating element (30) heats the fluid in the at least one fluid chamber (16) to at least partially evaporate the fluid so that the vapor pressure in the at least one fluid chamber (16) increases until the fluid is expelled out of the at least one fluid chamber (16) through the fluid outlet (29b) towards the medicament receiving element (14) and entrains the medicament towards the patient's skin.
