A tracheostomy tube has an inserting portion and a connecting portion. The inserting portion has an air way tube, an inflatable cuff and an inflating tube. The connecting portion is connected to the air way tube and has a resilient connector and a connecting sleeve. The resilient connector has a connecting ring connected to the air way tube. The connecting sleeve is mounted around the resilient connector and has a tubular body, a pressing flange formed on the tubular body and at least one slit defined longitudinally in the tubular body and extends through the pressing flange. Movement and vibrations of a patient circuit connected to the tracheostomy tube are not translated into a patient trachea thereby greatly improving patient comfort, safety and quality of life.