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Electron density measurements of a large-scaled negative ion source were carried out with a surface wave probe. By comparison of the electron densities determined with the surface wave probe and a Langmuir probe, it was confirmed that the surface wave probe is highly available for diagnostic of the electron density in H- ion sources. In addition, it was found that the ratio of the electron density to the H- ion density dramatically decreases with increase of a bias voltage and the H- ions become dominant negative particles at the bias voltage of more than 6 V.