An endoscope leak test connector includes: a rotating body configured to cause a ventilation member to project from a leak test pipe sleeve by rotating in a positive direction and cause the ventilation member to be buried into the leak test pipe sleeve by rotating in a negative direction; a gas inlet configured to be connected with a gas supply source; a facing member configured to face the ventilation member projecting from the leak test pipe sleeve; a gas outlet that is open on the facing member; and a seal portion configured to seal the gas outlet and the ventilation member so that the gas outlet and the ventilation member liquid-tightly communicate with each other.