PROBLEM TO BE SOLVED: To stably secure proper measurement accuracy by inserting a balloon in an appropriate state into the oral cavity by using a pressure measuring probe employing the flat balloon.SOLUTION: An oral cavity-related pressure measuring device includes: the pressure measuring probe 1 which is constituted in such a manner that the balloon 4 formed of an elastic material is held by a balloon base material 5； a communication member which has an inner cavity communicating with the inside of the balloon via the balloon base material so as to transfer air pressure thereof； and a pressure detecting section 8 which is connected to a back end of the communication member so as to detect the transferred air pressure. The balloon, which comprises a pressure receiving portion 2a forming space put into a closed state and a balloon pipe-like portion 2b communicating with the inside of the pressure receiving portion, is coupled to a leading end of the balloon base material via the balloon pipe-like portion. The balloon base material has a rib 5c which is protruded outward along the outer peripheral direction of the balloon-side leading end.【課題】扁平形状のバルーンを用いた圧力測定プローブを用い、口腔内にバルーンを適切な状態に挿入して良好な測定精度を安定して確保することを可能とする。【解決手段】弾性材料により形成されたバルーン４をバルーン基材５に保持させて構成された圧力測定プローブ１と、バルーン基材を介してバルーンの内部と連通しその空気圧を伝達する内腔を有する連通部材と、連通部材の後端と接続されて、伝達される空気圧を検出する圧力検知部８とを備える。バルーンは、閉鎖状空間を形成する受圧部２ａ及び受圧部の内部に連通するバルーン管状部２ｂを備え、バルーン管状部でバルーン基材の先端部に結合している。バルーン基材は、バルーン側の先端部の外周方向に沿って外方に隆起したリブ５ｃを有する。【選択図】図３Ａ
