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An analysis of solar neutrino data from the fourth phase ofSuper-Kamiokande~(SK-IV) from October 2008 to May 2018 is performed and theresults are presented. The observation time of the data set of SK-IVcorresponds to $2970$~days and the total live time for all four phases is$5805$~days. For more precise solar neutrino measurements, several improvementsare applied in this analysis: lowering the data acquisition threshold in May2015, further reduction of the spallation background using neutron clusteringevents, precise energy reconstruction considering the time variation of the PMTgain. The observed number of solar neutrino events in $3.49$--$19.49$~MeVelectron kinetic energy region during SK-IV is$65,443^{+390}_{-388}\,(\mathrm{stat.})\pm 925\,(\mathrm{syst.})$ events.Corresponding $\mathrm{^{8}B}$ solar neutrino flux is $(2.314 \pm 0.014\,\rm{(stat.)} \pm 0.040 \, \rm{(syst.)}) \times10^{6}~\mathrm{cm^{-2}\,s^{-1}}$, assuming a pure electron-neutrino flavorcomponent without neutrino oscillations. The flux combined with all SK phasesup to SK-IV is $(2.336 \pm 0.011\, \rm{(stat.)} \pm 0.043 \, \rm{(syst.)})\times 10^{6}~\mathrm{cm^{-2}\,s^{-1}}$. Based on the neutrino oscillationanalysis from all solar experiments, including the SK $5805$~days data set, thebest-fit neutrino oscillation parameters are $\rm{sin^{2} \theta_{12,\,solar}}= 0.306 \pm 0.013 $ and $\Delta m^{2}_{21,\,\mathrm{solar}} = (6.10^{+0.95}_{-0.81}) \times 10^{-5}~\rm{eV}^{2}$, with a deviation of about1.5$\sigma$ from the $\Delta m^{2}_{21}$ parameter obtained by KamLAND. Thebest-fit neutrino oscillation parameters obtained from all solar experimentsand KamLAND are $\sin^{2} \theta_{12,\,\mathrm{global}} = 0.307 \pm 0.012 $ and$\Delta m^{2}_{21,\,\mathrm{global}} = (7.50^{+ 0.19}_{-0.18}) \times10^{-5}~\rm{eV}^{2}$.

Solar neutrino measurements using the full data period of Super-Kamiokande-IV