In-situ stress orientations were determined by two independent methods in a scientific ocean drilling project in southwest Japan subduction zone. The first method is a core-based three-dimensional method called anelastic strain recovery (ASR) method; the second one is a traditional method using borehole wall image to analyze borehole wall compressive failures (breakouts) developed in oil industry which yields orientations of the principal horizontal stresses. The horizontal stress orientations at two drilling sites C0002 and C0006 showed having almost right angle; one is parallel with the direction of plate motion, however, the other one is perpendicular with it. The stress orientations independently determined by ASR measurements and borehole breakout analyses were consistent well at both the drilling sites.