The invention relates to a device for locking and unlocking the roller shutter (12, 15) of a container (10) that can be inserted into a rack (11) and removed therefrom. The roller shutter (12, 15) is pulled open by a stationary pin engaging therewith during insertion of the container (10), it is pulled shut by the same engagement of the pin (14) when the container (10) is pulled out of the rack (11). In the closed position, the roller shutter (12, 15) shall be locked reliably and accurately. Two locking pins (21, 22) that can be actuated by cam tracks (35, 36) extending in longitudinal direction of the rack (11) and provided at the rack (11) serve for this purpose. The first locking pin (21) serves to lock the roller shutter (12, 15), the second locking pin (22) keeps the roller shutter (12, 15) in its exactly defined closed position during the locking by the first locking pin (21). As a result thereof, position errors of the roller shutter (12, 15) during locking and unlocking are prevented.