A breathing apparatus is disclosed. The breathing apparatus is connected with a breathing tube and includes a host, a pressure sensor and a connecting device. The host includes a first shell with a connecting port and a first airflow channel penetrating through the first shell. The pressure sensor is disposed in the host and connected with the connecting port. The connecting device is connected between the host and the breathing tube separately, and includes a second airflow channel, a filter and an airflow guide port, wherein the second airflow channel communicates with the first airflow channel, and the filter is disposed in the second airflow channel for filtering an airflow from the breathing tube. An end of the airflow guide port communicates with the connecting port, and the other end of the airflow guide port receives the airflow without filtering. The pressure sensor detects the pressure of the airflow without filtering through the connecting port and the airflow guide port.本案關於一種呼吸裝置，與呼吸管相組接，且包含：主機，包含具有連通部件之第一殼體及貫穿第一殼體之第一氣流通道；壓力感測器，設置於主機內，且與連通部件相連接；以及連接裝置，係可分離地組接於主機及呼吸管之間，且包含第二氣流通道、過濾裝置及氣流導引部，其中第二氣流通道與第一氣流通道相連通，過濾裝置係設置於第二氣流通道內，用以過濾呼吸管所傳來之氣流，氣流導引部之端部與連通部件連通，氣流導引部之另一端部接收未經過濾之氣流；其中，壓力感測器經由連通部件及氣流導引部而偵測未經過濾之氣流之壓力。
