A female syringe comprising: a barrel for female syringe including a hollow barrel body having an inner peripheral surface on which a gasket is slidable, a cylindrical portion extended in a distal end direction from a distal end of the barrel body into which a nozzle of a male syringe is insertable, and a projection with which a screw of a lock adapter of the male syringe is screwable; a hollow cylindrical packing made of an elastic material and arranged in the cylindrical portion to be integrated with the cylindrical portion ; and a cap detachably attached to the cylindrical portion to liquid tightly close an opening of the packing , wherein when the cap is detached from the cylindrical portion , the packing integrated with the cylindrical portion remains in the cylindrical portion , the opening is opened, and the nozzle of the male syringe is liquid tightly fittable to an inner side of the packing , and at least in a state in which the cap is attached to the cylindrical portion and in a state in which the nozzle of the male syringe is liquid tightly fitted to the inner side of the packing , an outer peripheral surface of the packing is in close contact with an inner peripheral surface of the cylindrical portion so as to make a full circle of a liquid tight sealing portion in a circumferential direction of the cylindrical portion , wherein the cap includes a base and a convex fitting portion projecting in a proximal end direction from the base , and the packing is held in a compressed state over an entire circumference between the inner peripheral surface of the cylindrical portion and an outer peripheral surface of the convex fitting portion . a barrel for female syringe including a hollow barrel body having an inner peripheral surface on which a gasket is slidable, a cylindrical portion extended in a distal end direction from a distal end of the barrel body into which a nozzle of a male syringe is insertable, and a projection with which a screw of a lock adapter of the male syringe is screwable; a hollow cylindrical packing made of an elastic material and arranged in the cylindrical portion to be integrated with the cylindrical portion ; and a cap detachably attached to the cylindrical portion to liquid tightly close an opening of the packing , wherein when the cap is detached from the cylindrical portion , the packing integrated with the cylindrical portion remains in the cylindrical portion , the opening is opened, and the nozzle of the male syringe is liquid tightly fittable to an inner side of the packing , and at least in a state in which the cap is attached to the cylindrical portion and in a state in which the nozzle of the male syringe is liquid tightly fitted to the inner side of the packing , an outer peripheral surface of the packing is in close contact with an inner peripheral surface of the cylindrical portion so as to make a full circle of a liquid tight sealing portion in a circumferential direction of the cylindrical portion , wherein the cap includes a base and a convex fitting portion projecting in a proximal end direction from the base , and the packing is held in a compressed state over an entire circumference between the inner peripheral surface of the cylindrical portion and an outer peripheral surface of the convex fitting portion . <EOS>