To provide a medical tool that dramatically simplifies operations and has a small number of parts. For this purpose, the medical tool includes: an outer tube； a core that is inserted into the outer tube so as to be movable forward and backward； a medical tool main body that is attached to the core； and a containing member that is attached to the fore end of the outer tube, and is configured such that when by moving the outer tube forward relatively to the core, the containing member is made to approach the medical tool main body released out of the containing member, the containing member makes driving force for operating the medical tool main body act on the medical tool main body.
