This endoscope connector includes: a cylindrical part having an inlet port to which a fluid delivery device is connected, a discharge port for discharging fluid flowing in from the inlet port, and a flow channel for connecting the inlet port and the discharge port; a detection hole open on the external periphery of the cylindrical part and communicated with the flow channel; a retaining part for engaging with a mouthpiece of an endoscope and thereby retaining the discharge port in a position facing an opening of the mouthpiece; an urging member for stretching in a direction along the flow channel, the urging member being provided on the external periphery of the cylindrical part; and a cover part for advancing and retreating between a first position and a second position along the flow channel in conjunction with the urging member, the cover part being provided on the external periphery of the cylindrical part, and closing or narrowing the detection hole by moving to the first position for opening the detection hole by the urging force of the urging member when the retaining part is not engaged with the mouthpiece, and coming in contact with an outer surface of the endoscope and moving to the second position closer to the inlet port than the first position when the retaining part is engaged with the mouthpiece.