The present invention relates to a trocar assembly, comprising: a body portion 100 having a trocar 120 inserted into the abdomen of a patient, and a body 110 coupled to the rear end of the trocar 120； The penetration needle 120 is inserted through the inside and is provided to elastically extend and contract in the length direction of the penetration needle 120, and when the penetration needle 120 is inserted into the abdomen of the patient, the length is elastically increased. Including an elastic support portion 200 that is contracted and supported in close contact with the skin of the patient, wherein the elastic support portion 200 accommodates the permeation needle 120 therein, and the immersion tube 210 of a hard material provided to be variable in length and； An elastic cap 220 that accommodates the immersion tube 210 inside, the tip is fixedly coupled to the immersion tube 210 and is made of an elastic material； Separation cap 230 is detachably coupled to the upper portion of the immersion tube 210 and is detachably coupled to the body 110 when the elastic cap 220 and the immersion tube 210 are lengthened. Including, the immersion pipe 210, and a fixed pipe 211； A moving pipe 213 which is movably coupled to the fixed pipe 211 and has a tip fixed to the tip of the elastic cap 220； An immersion pipe support pipe 216 coupled to an upper portion of the fixed pipe 211 and to which a gas inlet pipe 240 for introducing gas into the fixed pipe 211 is coupled to an outer periphery； A gas that is seated on the stepped portion 216a of the submerged pipe support pipe 216 and prevents the gas flowing back into the fixing pipe 211 through the gas inlet pipe 240 in the direction of the separation cap 230 A leakage blocking member 217； It is fixedly coupled to the submerged tube support pipe 216, characterized in that it comprises a separation cap connecting member 219 coupled to the separation cap 230.본 발명은 트로카조립체에 관한 것으로서, 환자의 복부에 삽입되는 투침(120)과, 상기 투침(120)의 후단에 결합되는 본체(11
