There is provided an optical analysis technique enabling identification of a kind of light-emitting particle corresponding to a signal on a time series light intensity data or identification of a signal corresponding to light-emitting particles other than a particle to be observed in an optical measurement using a confocal microscope or a multiphoton microscope. The inventive optical analysis technique measures simultaneously and separately intensities of lights of two or more wavelength bands from a light detection region in a sample solution containing light-emitting particles of two or more kinds to generate time series light intensity data of the respective wavelength bands; detects signals simultaneously generated on the time series light intensity data of at least two wavelength bands; and identifies the simultaneously generated signals as signals of a light-emitting particle of at least one specific kind.