An optical scanning device according to the present invention includes an optical fiber, a signal generating unit that generates a driving signal having a frequency fd different from a resonance frequency fr of the optical fiber, and a driving unit that spirally vibrates the tip of the optical fiber according to the driving signal Wherein the signal generator includes a first period in which the amplitude gradually increases from substantially zero to a maximum value during one scanning period and a second period in which the amplitude gradually decreases from the maximum value to approximately zero, A drive signal satisfying the following conditional expression (1) is generated. N 2 is the vibration frequency of the drive signal in the second period.本発明の光走査装置は、光ファイバと、光ファイバの共振周波数frとは異なる周波数fdを有する駆動信号を生成する信号生成部と、駆動信号に従って光ファイバの先端をスパイラル振動させる駆動部とを備え、信号生成部は、1回の走査期間中に振幅が略ゼロから最大値まで漸次増大する第1の期間および振幅が最大値から略ゼロまで漸次減少する第2の期間を含み、かつ、以下の条件式(1)を満足する駆動信号を生成する。N2は、第2の期間における駆動信号の振動回数である。
