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.