  An outline is explained for hadron-physics projects at J-PARC, which is
considered to be one of the flagship facilities in hadron physics from 2008.
The facility provides an intensity frontier with 50 GeV proton beam for nuclear
and particle physics. It could cover a wide range of hadron physics from
strongly interacting many-body systems with an extended hadronic degree of
freedom, strangeness, to new forms of hadrons and hadronic matters. These
studies lead not only to create innovative fields of hadron physics but also,
possibly, to understand fundamental interactions because of recent progress on
AdS/CFT correspondence. At the first stage of the J-PARC operation, hadron
topics are mainly on strangeness nuclear physics such as hypernuclei, kaonic
nuclei, and possible pentaquark hadrons. Then, the studies could be extended to
exotic hadron searches, chiral dynamics in nuclear medium, structure functions,
hard exclusive processes, hadron physics in neutrino scattering, and spin
structure of the nucleon. With major upgrades of the facility, extensive
studies could be done for the nucleon spin, heavy-ion physics, and hadron
physics at a high-energy neutrino factory.
