The present invention is a sample analyzer 100 that makes it possible to accurately analyze a sample even when the sample is such as one in a state where particles are cross-linked, or one containing foreign bodies and that calculates an autocorrelation function from a detection signal obtained by irradiating a sample with inspection light L1, and from the autocorrelation function, analyzes the sample. In addition, the sample analyzer 100 includes: an autocorrelation function determination part 53 that determines whether or not the displacement amount of an autocorrelation function serving as a comparison target from an autocorrelation function serving as a reference is within a predetermined range; and a sample analysis part 54 that analyzes the sample with use of an autocorrelation function of which the displacement amount is determined by the autocorrelation function determination part 53 to be within the predetermined range.