The present invention provides a novel infusion set which is an infusion set comprising first member(s) constituting primary tubing and second member(s) constituting instant tubing, and at which there is covering by a cap, arranged at which there is an opening configured so as to not allow passage therethrough of solid or liquid but so as to allow passage therethrough of gas at the interior of the cap, a hydrophobic filter being arranged at a location inward from where the tip of a connector for connection with a three-way stopcock or a connector for connection with an intravenous drip needle is inserted at the interior of the cap by way of an insertion port, and a lid at the exterior of said opening for closing said opening, as a result of which it is possible to carry out priming by means of a simple operation without leakage of liquid and in which ease of operations is improved due to the fact that first member(s) and second member(s) can be connected as desired by three-way stopcock(s) 5 coloring optionally being applied thereto and it is possible to maintain stability of the infusion set and IV stand, to prevent bodily pain to patients and leakage of liquid at locations where intravenous needles are inserted, and to prevent occurrence of accidents due to human error with regard to administration procedures, and which makes it possible to easily establish standard procedures for use.
