The present invention provides a mouth gag including a flexible skelton having a V-shaped supporting portion. Both ends of the supporting portion are respectively formed to be an upper supporting portion and a lower supporting portion so as to respectively provide the patient's upper dentition and lower dentition with a bite. A space exists between the upper supporting portion and the lower supporting portion. The patient's upper dentition and the lower dentition respectively bite the upper supporting portion and the lower supporting portion so as to make mouth open. By the support of this flexible skeleton, the problem of the patient's discomfort caused by opening mouth for a long time can be improved.本發明提供一種口腔張口器，包括；一可撓性骨架具有一V形的支撐部，該支撐部之雙端分別形成有提供病患之上、下齒列咬合的一上承持部及一下承持部，該上承持部及下承持部之間具有一間距，病患之上、下齒列分別咬合上承持部及下承持部而使口腔呈現張開的狀態；藉由可撓性骨架的支撐，以改善病患因長時間張開口腔而生成之不舒適感的問題。
