Experimental method, which detects local magnetic field by using muon, is known as muon spin rotation/relaxation/resonance (μSR) method.μSR has extremely high sensitivity for local magnetism and is complementary technique with neutron experiment. For example, detectable time window of μSR is different from neutron experiment. In this article, we introduce the μESR technique and it's application. Both muon and neutron experimental facility will be located in same J-PARC materials and life science facility building. Here I wish to have a good scientific communication as the facilities in the next at J-PARC.
