Abstract: Disclosed herein is a piezoelectric generator unit using a piezoelectric bimorph. The piezoelectric generator unit includes a cylindrical housing, a fly wheel rotated within the housing by external power and provided with plural protrusions arranged at a regular interval in the circumferential direction, a fluid ejection device transmitting power to the fly wheel by ejecting a fluid or air onto impellers of the fly wheel to rotate the fly wheel, plural piezoelectric members installed radially and contacting the plural protrusions to generate electricity due to impact, and a central shaft connected to the plural piezoelectric members via connection members. The piezoelectric generator unit effectively converts a linear motion into a rotary motion simply using slight impact or vibration so as to effectively generate electrical energy, generates high output at low input so as to improve power generation efficiency, and is applicable to various fields using a moving load.