The present invention relates to a trocar for laparoscopic surgery for performing the laparoscopic surgery through a surgical instrument by making a puncture in the abdomen of a patient, the trocar including: a head unit 10 including an upper case 11 and a lower cover 12; a base unit 20 including a lower case 24 having a trocar sleeve fixing protrusion 21 in a lower part thereof and a coupling member 25 installed at an upper surface thereof; a trocar sleeve 17 installed at the trocar sleeve fixing protrusion 21; a lip valve 60 installed within the head unit 10 and having a tapered lower part; an insertion unit 30 installed at the upper part of the lip valve 60; a button unit 40 including a button 41 elastically installed at an elastic bush 43; and a trocar needle 50 introduced into the trocar sleeve 17 through the lip valve 60 or the insertion unit 30.