A heat exchanger tube comprising an Al alloy extruded tube, and a flux layer including Si powder, Zn-containing flux, and binder formed on an outer surface of the Al alloy extruded tube, wherein an amount of the Si powder applied on the Al alloy extruded tube is in a range of 1 g/m 2 or more and 5 g/m 2 or less, an amount of the Zn containing flux applied on the Al alloy extruded tube is in a range of 3 g/m 2 or more and 20 g/m 2 or less, and the Si powder has a particle diameter distribution such that 99% particle diameter is 5 µm or more and 20 µm or less, and an amount of coarse particle having a diameter of not smaller than 5 times (D 99 ) is less than 1 ppm, where (D 99 ) denotes a critical diameter defined such that cumulative volume of particles not larger than (D 99 ) constitute 99% by volume of all the particles.