The carabiner (1) comprises: A body (2) defining a slot (3) for introducing a rope (4) extended by a retention zone (5) of the rope (4), A first blocker (6) mounted movably between a waiting position of the rope (4) in the insertion slot (3) and a closing position when the rope (4) is in the retention zone ( 5), the shutter position being configured to prohibit the insertion of another rope (4) into the retention zone (5), A second blocker (10) configured to allow a movement of the rope (4) from the insertion slot (3) to the retention zone (5) and to prohibit movement of the rope (4) from the zone retention (5) towards the slot (3) of introduction.
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