Provided is an optical scanning image forming apparatus, including: a light source section an illumination scanning section scanning illumination light from the light source section and irradiating the illumination light onto an object a light detection section detecting detection light from the object a calculation section calculating: a drive waveform for providing a light scanning pattern to be formed by the illumination scanning section and a coordinate for image construction and an image drawing section drawing an image based on the detection light detected by the light detection section and the coordinate for image construction, the drive waveform consisting of, in a predetermined period, a plurality of frames of different phases. Also provided is an optical scanning image forming method, including the steps of: setting a drive frequency, a period, and the number of frames in 1 period of a drive waveform for providing a light scanning pattern generating, based on the set drive frequency and period, the drive waveform and coordinate data for image construction scanning an illumination light according to the light scanning pattern provided by the generated drive waveform detecting detection light from an object and drawing an image based on the detected detection light and the coordinate data for image construction.
