Routine observations of strain changes have been performed at Toshima 800 m borehole in Awaji Island, Western Japan, since 1996. We investigated elastic property in the fault zone using tidal changes and effect of atmospheric loading in the observational data. Young's modulus in the crust was calculated to be 28-36 GPa. This modulus is a little less than general Young's modulus of granite . It is consider that the determined low Young's modulus was caused by high crack density . Amplitude of tidal strain and admittance of atmospheric effect have been increasing since 1997 . It is considered that increasing of those factors was caused by decreasing of pore pressure around the borehole. Direction of maximum tidal amplitude and direction of maximum constriction due to atmospheric loading indicate that Young's modulus in the crust is the lowest in the northeast-southwest direction .