To offer a laryngeal mask airway which can be manufactured at a low cost and its manufacture.

The laryngeal mask airway includes a mask part 13 and an extension tube 1, the extension tube opens within the part 13 of a tip part 14 on a patient side in front of it and the part 13 is arranged within a lower larynx for airway ventilation for the patient at the time of using and adjusted to open a part on a front side. The part 13 is provided with a nearly elliptic fixing member 15 fixed to the tip part 14 on the patient side of the tube 1. Then, the tube 1 opens at the tip part on the side of the patient through an opening part 22 on the front surface 19 of the member 15, the part 13 is provided with an extensible member 16 provided with an extensible ring 22 and a center web extended within this ring, and the web is provided with an opening part 26 fixed to the front surface 19 of the member 15 and matched to the opening part of the member 15.