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Electroanalysis is a way to detect analytes by measuring the current or potential on an electrode interface during a redox reaction. However, analytes that can be detected by the methods at conventional electrode materials have been limited due to a narrow measurable potential range and insufficient sensitivity for trace analytes. This article reviews our recently developed nanocarbon film electrodes for detecting trace amounts of various analytes. We have been studying nanocarbon film electrodes formed by electron cyclotron resonance sputtering or an unbalanced magnetron sputtering method. The film provides a nanocrystalline sp(2) and sp(3) mixed bond structure with an atomically flat surface (surface roughness of 0.05 - 0.1 nm) and high conductivity without doping. The film electrode has excellent properties, including a low background current, a wide electrochemical potential window, and little surface …