A nebulizer for a fluid which has a conveying tube for conveying fluid and a method for producing a thick-walled capillary. The conveying tube or the capillary is of multipart and/or double-walled construction, and in particular, is made up of a number of parts, such as an inner tube and an outer tube. This construction allows the device to be manufactured more easily and cheaply, in particular, when the inner diameters are very small.
