PROBLEM TO BE SOLVED: To sufficiently take in and exhaust air from an air hole while ensuring a sufficient interval between an upper connection part and a lower connection part even when the upper connection part is pressed downward by an upper lip or the lower connection part is pressed upward by a lower lip.SOLUTION: An oral cavity insertion instrument 1 comprises: a forward projecting part 60 having an opposite wall part 64 projecting forward from the center of a base part 10 and facing the base part 10 with an interval for the base part 10 through which an upper lip can be inserted, an opposite wall part 65 facing the base part 10 with an interval for the base part 10 through which a lower lip can be inserted, an upper connection part 62 connecting the opposite wall part 64 and the base part 10, and a lower connection part 63 connecting the opposite wall part 65 and the base part 10 and facing the upper connection part 62 with a prescribed interval and a movement restriction part 11 disposed between the upper connection part 62 and the lower connection part 63 at the left and right sides of the forward projecting part 60 and erected in front of the base part 10.SELECTED DRAWING: Figure 5COPYRIGHT: (C)2017,JPO&INPIT【課題】上唇により上接続部が下方に押圧された場合、又は下唇により下接続部が上方に押圧された場合であっても、上接続部と下接続部との間に十分な間隔を確保して、空気孔から十分に空気を取り込んだり排出すること。【解決手段】口腔挿入具1は、ベース部10の中央から前方に突出し、ベース部10との間に上唇を挿入可能な間隔を設けてベース部10に対して対向する対向壁部64と、ベース部10との間に下唇を挿入可能な間隔を設けてベース部10に対向する対向壁部65と、対向壁部64とベース部10とを接続する上接続部62と、対向壁部65とベース部10とを接続すると共に上接続部62に対して所定の間隔を設けて対向する下接続部63と、を備える前方突出部60と、前方突出部60の左右側方において上接続部62と下接続部63との間に配置され、ベース部10より前方に立設される移動規制部11と、を有する。【選択図】図5
