The scanning endoscope apparatus has a light guide section that guides illumination light and emits from the tip, and a drive section that swings the tip of the light guide section when a drive voltage is applied, A scanning unit in which the amplitude of the oscillation according to the frequency of the drive voltage varies due to a temperature change, a lens for condensing the illumination light emitted from the tip of the light guide unit toward the subject, and a lens A holding part and a driving part set at a frequency for suppressing the change in the irradiation position of the illumination light on the object due to the change in the frequency characteristic of the amplitude of the amplitude of the tip of the light guide part due to the temperature change due to the expansion or contraction of the lens part due to the temperature change And an applying unit for applying a voltage to the driving unit. 走査型内視鏡装置は、照明光を導光し、先端から出射する導光部と、駆動電圧が印加されることによりに導光部の先端を揺動する駆動部と、を有し、駆動電圧の周波数に応じた揺動の振幅が温度変化のために変化する走査部と、導光部の先端から出射される照明光を被検体に向けて集光するレンズと、レンズを保持する保持部と、温度変化によるレンズ部の膨張又は収縮により、被検体における照明光の照射位置の変化を、温度変化による導光部先端の振幅の周波数特性の変化により抑制する周波数に設定された駆動電圧を駆動部に印加する印加部とを有する。
