A tilt-sensing apparatus for sensing whether the tilt of an object exceeds a predetermined level, and to an automatic posture control apparatus using same. An amplifying lever moves along with a tilt lever which rotates in accordance with the level of fluid. in a balanced state, the end of the amplifying lever is spaced apart by a predetermined gap from a contact of a case. when the tilt of the object significantly exceeds a predetermined level, the case fixed at the object is tilted together with the object. the tilt lever in the case keeps the balanced state by the level of fluid, the tilt lever rotates in one direction relative to the case, and the rotational displacement of the tilt lever is amplified by the amplifying lever to enable contact sensors and contacts to be interconnected and turned to the ON state.