PROBLEM TO BE SOLVED: To solve the problem of a pressure sensor being incapable of detecting pressure of oxygen supplied from an oxygen cylinder.SOLUTION: A respiration synchronizer comprises: an oxygen supply part 11 a cannula 30 a pressure sensor 33 and an electromagnetic valve 40 provided in a flow passage connecting the oxygen supply part 11 with the cannula 30, the electromagnetic valve switching and connecting the cannula 30 to the oxygen supply part 11 or the pressure sensor 33. The electromagnetic valve 40 comprises: an oxygen supply port 63 an oxygen discharge port 64 and a pressure detection port 65. The electromagnetic valve includes a valve body 68 for performing switching between an oxygen supply state in which the oxygen discharge port 64 communicates with the oxygen supply port 63 and an oxygen non-supply state in which the oxygen discharge port 64 communicates with the pressure detection port 65 and makes the three port communicate with one another for a predetermined time when performing switching between the oxygen supply state and the oxygen non-supply state.SELECTED DRAWING: Figure 4【課題】酸素ボンベから供給される酸素の圧力を圧力センサが検知できないという問題がある。【解決手段】酸素供給部11と、カニューラ30と、圧力センサ33と、酸素供給部11とカニューラ30とを結ぶ流路に設けられ、カニューラ30を酸素供給部11または圧力センサ33に切り換えて接続する電磁弁40とを備え、電磁弁40が、酸素供給ポート63と、酸素排出ポート64と、圧力検出ポート65とを備え、酸素排出ポート64と酸素供給ポート63とが連通した酸素供給状態と、酸素排出ポート64と圧力検出ポート65とが連通した酸素非供給状態とを切り換える弁体68とを有し、酸素供給状態と酸素非供給状態とを切り換えるとき、3つのポートを所定時間、連通させる。【選択図】図4
