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 11； a core 12 that is inserted into the outer tube 11 so as to be movable forward and backward； a medical tool main body 2 that is attached to the core 12； and a containing member 6 that is attached to the fore end of the outer tube 11, and is configured such that when by moving the outer tube 11 forward relatively to the core 12, the containing member 6 is made to approach the medical tool main body 2 released out of the containing member 6, the containing member 6 makes driving force for operating the medical tool main body 2 act on the medical tool main body 2.
