An endoscope cleaning/disinfecting apparatus includes: a medicinal solution storage portion a cleaning/disinfecting tank a medicinal solution supplying conduit having one end communicating with the medicinal solution storage portion and the other end opening toward the cleaning/disinfecting tank a medicinal solution supplying member a medicinal solution receiving member provided inside the medicinal solution supplying member and a medicinal solution collecting port which is openable/closable by a lid body, and formed at a position between the medicinal solution receiving member and the opening of the other end in the medicinal solution supplying conduit.
