Referring to FIG. 1, a lower electrode 10 in a capacitor according to the embodiment of the present invention is formed of a refractory metal such as Ti, Ta and W or a refractory metal compound such as TiN, TiSiN, TiAlN, TaN, TaSiN, TaAlN and WN. In particular, when the lower electrode 10 has a three-dimensional structure such as a cylindrical shape, a refractory metal or refractory metal compound