A nozzle cleaning apparatus, a coating apparatus, a nozzle cleaning method, and a coating method for preventing a mist or the like from adhering to a portion affecting a coating performance of an object to be treated when cleaning a member related to the wiping of the slit nozzle do. The closed space L1 is formed and the wiping member 41 to be removed by wiping off the adherend 100 of the slit nozzle 30 is cleaned in the closed space L1. In the closed space L1, a discharge port 491 for discharging gas-liquid inside the closed space L1 to the outside of the apparatus is formed. Therefore, the biphasic cleaning liquid (WL) used for cleaning the wiping member 41 and the mist generated by the cleaning are discharged from the discharge port 491 to the outside of the apparatus, As shown in Fig.;
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