  At Kamioka Observatory many activities for low energy rare event search are
ongoing. Super-Kamiokande(SK), the largest water Cherenkov neutrino detector,
currently continues data taking as the fourth phase of the experiment (SK-IV).
In SK-IV, we have upgraded the water purification system and tuned water flow
in the SK tank. Consequently the background level was lowered significantly.
This allowed SK-IV to derive solar neutrino results down to 3.5MeV energy
region. With these data, neutrino oscillation parameters are updated from
global fit; $\Delta m^2_{12}=7.44^{+0.2}_{-0.19}\times10^{-5} {\rm eV}^2$,
$\sin^2\theta_{12}=0.304\pm0.013$, $\sin^2\theta_{13}=0.030^{+0.017}_{-0.015}$.
NEWAGE, the directional sensitive dark matter search experiment, is currently
operated as "NEWAGE-0.3a" which is a $0.20\times0.25\times0.31$ m$^3$ micro-TPC
filled with CF4 gas at 152 Torr. Recently we have developed "NEWAGE-0.3b". It
was succeeded to lower the operation pressure down to 76 Torr and the threshold
down to 50 keV (F recoils). XMASS experiment is looking for scintillation
signals from dark matter interaction in 1 ton of liquid xenon. It was designed
utilizing its self-shielding capability with fiducial volume confinement.
However, we could lower the analysis threshold down to 0.3 keVee using whole
volume of the detector. In February 2012, low threshold and very large exposure
data (5591 kg$\cdot$days) were collected. With these data, we have excluded
some part of the parameter spaces claimed by DAMA/LIBRA and CoGeNT experiments.

Instrumentation and Detectors;Instrumentation and Methods for Astrophysics;High Energy Physics - Experiment;Nuclear Experiment