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We present direct observation of the M1 transition between the fine structuresplitting in the 4f13 5s2 5p6 2F ground state of W VIII. The spectroscopic dataof few-times ionized tungsten ions are important for the future ITERdiagnostics, but there is a serious lack of data. The present study is part ofan ongoing effort to solve this lack. Emission from the tungsten ions producedand trapped in a compact electron beam ion trap is observed with aCzerny-Turner visible spectrometer. Spectra in the EUV range are also observedat the same time to help the identification of the previously-unreportedvisible lines. The observed wavelength 574.47 pm 0.03 nm (air), whichcorresponds to the fine structure splitting of 17402.5 pm 0.9 cm-1, showsreasonable agreement with the previously reported value 17410 pm 5 cm-1obtained indirectly through the analysis of EUV spectra [Ryabtsev et al., Atoms3 (2015) 273].

Direct observation of the M1 transition between the ground state fine structure splitting of W VIII