The resonance frequency difference between the X-axis direction and the Y-axis direction of the optical fiber is reduced, and stable scanning performance is obtained at the same resonance frequency. An optical fiber scanner (10) according to the present invention includes an optical fiber (11), a vibration part (19) that vibrates the optical fiber (11), and a fixing part (13) that fixes the optical fiber (11). . The vibration part (19) includes a piezoelectric element (12) and an elastic member (14) that transmits the vibration of the piezoelectric element (12) to the optical fiber (11). The piezoelectric element (12) includes a first piezoelectric active region (20) and a second piezoelectric active region (21), and a piezoelectric inactive region (22) arranged so as to fill between the adjacent end faces. Prepare. At the position of the vibration part (19), 2 perpendicular to the longitudinal axis of the optical fiber (11) having a cross-sectional shape constituted by the piezoelectric element (12), the optical fiber (11) and the elastic member (14), and 2 perpendicular to each other. The moment of inertia of area in the axial direction is substantially the same.光ファイバのX軸方向とY軸方向の共振周波数差を小さくし、同一の共振周波数で安定した走査性能を得る。本発明に係る光ファイバスキャナ(10)は、光ファイバ(11)と、光ファイバ(11)を振動させる振動部(19)と、光ファイバ(11)を固定する固定部(13)とを備える。振動部(19)は、圧電素子(12)と、圧電素子(12)の振動を光ファイバ(11)に伝達する弾性部材(14)とを備える。圧電素子(12)は、第1の圧電活性領域(20)および第2の圧電活性領域(21)と、これらの隣接する端面間を埋めるように配置された圧電不活性領域(22)とを備える。振動部(19)の位置において、圧電素子(12)、光ファイバ(11)および弾性部材(14)によって構成される横断面形状の光ファイバ(11)の長手軸に直交しかつ互いに直交する2軸方向の断面二次モーメントが略同一である。