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The goal of the
hadron physics is to understand the origin of the mass of the matter and
mechanism of the confinement of quarks. Baryons which
contain heavy quark(s) are good probes to study the interaction of the quarks
inside the hadron. Because its motion
inside the hadron is rather small, the non-relativistic potential approach is a
good approximation for the
interaction of heavy quarks. Currently, no doubly charmed baryon (Ξcc) is
established experimentally although its existence is
predicted by the constituent quark model.  In this talk, the result
of the Ξcc search at Belle experiment and other results related to
charmed baryons are presented.