A nonradiative dielectric waveguide which includes a first housing and a second housing. The first housing and the second housing respectively include first and second dielectric units and conductor electrodes. The first and second dielectric units are respectively integrally formed with first and second planar portions, and first and second dielectric strip line portions extending outwardly from said first and second planar portions and by a predetermined height, with abutting faces generally parallel with the conductor electrodes and being provided at top portions of said dielectric strip line portions. The conductor electrodes are respectively formed in close contact with faces of the first and second dielectric units remote from the abutting faces. The first and second housings are overlapped so as to make the abutting faces confront each other. The first and second dielectric strip lines portions cooperate to propagate electromagnetic waves. The disclosure is also directed to a manufacturing method of the above nonradiative dielectric waveguide.