Patent ID: 8857069

Claim:
A tilt detecting device, comprising a first tilt sensor for detecting a tilting with respect to direction of gravity with high accuracy, a second tilt sensor for detecting the tilting with respect to direction of gravity and for detecting the tilting with lower accuracy than that of the first tilt sensor and in a range wider than that of the first tilt sensor, wherein said first tilt sensor and said second tilt sensor are fixed relatively to each other, and the tilting is detected by said second tilt sensor by using a reference position and a detecting direction as detected by the first tilt sensor as reference, wherein said second tilt sensor can be set in a plurality of small detection ranges where detection ranges of tilting are partially superimposed on or continuous to each other, and among said plurality of small detection ranges, a reference of a first small detection range is set by said first tilt sensor, and a reference of said second small detection range is a predetermined value obtained in said first small detection range superimposed on or continuous to said second small detection range.