This paper deals with a new type of slope sensor using a thin plate piezoelectric bending vibrator loaded with moment impedance. This sensor is fabricated on the basis of the gyro-moment motor already reported by one of the authors. In the first part of this paper, the construction of this sensor and its operation principle are described. In the second part, basic experimental results proving the principle are presented. Moreover, we show the results of finite element method simulations of some constructions of the slope sensor.