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In thiswork,we present the results of an experimental study of the Stark shifts of atomic helium lines at 706.519, 728.135, 471.315, 501.568, 667.815 and 447.148 nm in the electron density range (0.6-7)× 1023 m-3. Stark shift is always presented together with the corresponding electron density and electron temperature. Best-fitting formulas of experimental data enable plasma electron density diagnostics with an accuracy of (15-20 per cent) in the temperature range (10 000-30 000) K. The influence of Debye shielding on the Stark shifts is carefully examined and the experimental results are compared with other experimental and theoretical data. [ABSTRACT FROM AUTHOR]