There is provided a high-frequency dielectric material that has a high relative permittivity, a high Q value, and a TCF property value close to zero (0) and can realize co-firing of the dielectric material with silver (Ag) and copper (Cu). The high-frequency dielectric material is characterized by comprising a composition of main constituent materials having a formulation of CaO: 1 mole, Nb2O5: (1−α×β)/3 mole, ZnO: (1−α)/3 mole, TiO2: γ mole, and Li2O: α×(1−β)/6 mole, wherein 0.65≦α≦0.75, 0.09≦β≦0.15, 0.066≦α×β≦0.100, and 0.15≦γ≦0.35; and 1 to 5 parts by weight, based on 100 parts by weight of the composition of main constituent materials, of a sintering aid selected from the group consisting of oxides of copper (Cu), boron (B), lithium (Li), bismuth (Bi), and vanadium (V) and a mixture of two or more of the oxides.