The present invention provides a nozzle cleaning method and a nozzle cleaning device which allow to surely perform cleaning of a dispensing nozzle and which allow reduction in cleaning time. For this purpose, a nozzle cleaning method for cleaning a dispensing nozzle (50) for suctioning and discharging a liquid includes: a first cleaning step in which, after termination of dispensing, an inner wall surface of the dispensing nozzle (50) is cleaned in an upper portion of a storage tank (62) overflowed with a cleaning liquid (L2) by discharging a liquid for preload (L1); and a second cleaning step in which at least an outer wall surface is cleaned by lowering and immersing the dispensing nozzle (50) into the storage tank (62) overflowed with the cleaning liquid (L2).