Vehicle state detecting device and vehicle state detecting system

A vehicle state detecting device provided with acceleration sensors respectively disposed on three axes in such a way as to be able to detect acceleration in each of directions of three axes, and mounted to a vehicle, said vehicle state detecting device comprising:

• an arithmetic operation unit for determining a gravity direction from a sum of vectors which are results of detection acquired by said acceleration sensors to correct an inclination of said mounting, and for detecting acceleration in a longitudinal direction of said vehicle, acceleration in a rightward or leftward direction of said vehicle, and acceleration in an upward or downward direction of said vehicle,
• said vehicle state detecting device being mounted to each of both left and right sides of the vehicle, and performing an arithmetic operation on the acceleration in each of the directions of the three axes which is detected on each of both the left and right sides of the vehicle to detect a state of the vehicle.