  J-PARC neutrino beamline has been operated since 2009. Until May 2018, the
maximum beam power achieved was ~500 kW. In future, the beam power will be
upgraded to 1.3 MW. After the stable operation in late 2020s, we can accumulate
~30 x 10^20 POT data per year. It is almost the same number as total POT
accumulated in recent 10 years. The upgrade plan of the Main Ring as well as
the neutrino beamline is reported.
