Piezoelectric effects are observed in a mixed cholesteric liquid crystal layer. It is sandwiched by a pair of nesa‐coated glass plates one of which is subjected to lateral motion to develop the shear vibration in the layer. It is found that the electric potential is generated from the layer, the frequency of which is the same as that of the exciting vibration. Three cases of the molecular orientation process for the liquid crystal layer are tested: (i) previous impression of dc voltage, (ii) lecithin application on the surfaces of the substrate glass plates, and (iii) previous static shear strain on the layer. 10–20 mV peak‐to‐peak (p‐p) are generated for the vibratory displacement of 1 &mgr;m (p‐p) of 25 kHz.