The front end of the body fluid suction tube of the body fluid such as phlegm, saliva for attracting pipe tracheae insert pipe inside become posture appropriate always, so as to attract well patient pipe body fluid. For being inserted into body fluid suction tube (1) and its application method of the tracheae for the being inserted through tracheae insert pipe (6) to attract the body fluid (9) such as phlegm, saliva inside tracheae (8), for body fluid suction tube (1) when the inside that tracheae inserts pipe (6) is bent, only front end is pushed on the front inner surface of tracheae insert pipe (6) by elastic force. In addition, above-mentioned body fluid suction tube (1) is linearly under the unused state being inserted into before tracheae insert pipe (6).
