A setting tool includes a piston guide (13) displaceably arranged in the housing (11), a bolt guide (12) connection element (16) for fixedly connecting the bolt guide (12) with the piston guide (13) for joint displacement therewith, and a locking member (23) provided on the setting tool (10) and having a locking position (27) in which displacement of the bolt guide (12) and the piston guide (13), relative to the housing (11), from their initial position, is prevented when the bolt guide (12) and the piston guide (13) are not completely connected by the connection element (16), and a release position (26) in which displacement of the bolt guide (12) and the piston guide (13) relative to the housing (11) from their initial position to their operational position, can take place when the bolt guide (12) and the piston guide (13) are completely connected by the connection element (16).