A buckle (1) having a first buckle part (2) and having at least one second buckle part (3), said first buckle part (2) having at least one locking bar (4) that can be moved back and forth between a locking position of the locking bar (4) and an unlocking position of the locking bar (4). The locking bar (4) engages behind a locking surface (5) of the second buckle part (3) in the locking position in order to lock the two buckle parts (2, 3) with each other in a connected position of the buckle parts (2, 3), and the locking bar (4) can be moved into the unlocking position in order to separate the buckle parts (2, 3), the second buckle part (3) having at least one counter locking bar (6) that can be moved back and forth between a locking position of the counter locking bar (6) and an unlocking position of the counter locking bar (6).