A medical tube is disclosed, which is configured so that an implant to be placed indwelling in a living body can be inserted in the medical tube and includes an extension section which extends the overall length of the medical tube. A medical device set includes the medical tube, and an operation mechanism for operation to actuate an extension mechanism. A method of placing an implant indwelling in a living body, by temporarily inserting the implant in a medical tube, includes preliminarily extending the overall length of the medical tube prior to placing the implant indwelling.
