This disclosure aims to provide an optical scanning observation apparatus that can improve image quality. This optical scanning observation apparatus 10 includes a light emission timing controller 32, a fiber 11, a driver 21, a photodetector 35, an offset processor 70 that corrects an offset value based on an electrical signal output by the photodetector while a light emission timing controller suspends light emission of a light source, and a signal processor 37 that generates an image signal based on the electrical signal for which the offset value was corrected by the offset processor.
