To provide the air preheater for a hot melt adhesive-feeding nozzle mounted to an adhesive feed manifold.

In the air heater for preheating the air supplied to the hot melt adhesive-feeding nozzle, an inside heating member 110 having a heater in its inside and an outside heating member 130 provided with a fluid outlet connected to a fluid inlet of the inside heating member 110 are provided, and the outside heating member 130 has a fluid feed inlet provided in at least the vicinity of its outside part, and the fluid feed inlet of the outside heating member 130 is communicated to the fluid outlet of the outside heating member 130 through the fluid passage formed at the outside heating member 130, and the fluid is heated gradually at between the fluid feed inlet of the outside heating member 130 and the fluid inlet of the inside heating member 110.