PROBLEM TO BE SOLVED: To provide an endoscope cleaning and disinfecting apparatus including a configuration capable of effectively utilizes a space formed within a top cover.SOLUTION: The endoscope cleaning and disinfecting apparatus includes a cleaning and disinfecting tub provided in a body of the apparatus for housing an object to be cleaned and disinfected, and a cover 3 having a space inside and freely opened and closed with respect to the body so as to open and close a housing port of the object to be cleaned and disinfected of the cleaning and disinfecting tub. The space constitutes a housing part 200 used for a member or a liquid for cleaning and disinfecting the object to be cleaned and disinfected.