For use in premature babies and infants, in particular for administering surfactant to the lungs, the inhalation therapy device described herein comprises an aerosol generating device 1, a respiratory air flow generating means 3 and a nebulising chamber 5 into which the generated liquid droplets 2 and the respiratory air flow 4 are supplied. The nebulising chamber 5 comprises a tapering area 52 which ends in a tubular intubation means 6. The intubation means 6 is designed such that the intubation end 6b can be positioned in such a manner that the liquid droplet/respiratory air mixture conveyed via the intubation means is released behind those areas of the respiratory tract that filter out to a great extent the liquid droplets from the mixture.