A device for detecting angular acceleration, the device including: - a chassis having a rotation axis passing through the chassis, - an output member movable relative to the chassis, from a non-detection position toward a detection position separate from the non-detection position, - movable means (24, 112) cooperating mechanically with the chassis such that a rotational movement of the chassis around the rotation axis causes a movement of the movable means relative to at least part (14, 110) of the device, from a first position toward a second position separate from the first position, - first blocking means (46, 102, 118) cooperating mechanically with the movable means (24, 112) such that a movement of the movable means from the first position to the second position causes a movement of the first blocking means from a non-blocking position to a blocking position, the non-blocking position being a position in which the first blocking means authorize a movement of the output member from the non-detection position to the detection position, and the blocking position being a position in which the first blocking means prevent a movement of the output member from the non-detection position to the detection position, - second blocking means (52, 60a, 60b) movable under the effect of a centrifugal force (F2, F1) induced by the rotational movement of the chassis, from a retention position to a release position, the retention position being a position in which the second blocking means prevent a movement of the output member from the non-detection position toward the detection position, and the release position being a position in which the second blocking means authorize a movement of the output member from the non-detection position toward the detection position, the movable means (24, 112), and the first (46, 102, 118) and second blocking means (52, 60a, 60b) being configured such that a movement of the output member from the non-detection position to the detection position indicates that the speed of the rotational movement of the chassis has exceeded a rotational speed threshold before the first blocking means have reached the blocking position. - a chassis having a rotation axis passing through the chassis, - an output member movable relative to the chassis, from a non-detection position toward a detection position separate from the non-detection position, - movable means (24, 112) cooperating mechanically with the chassis such that a rotational movement of the chassis around the rotation axis causes a movement of the movable means relative to at least part (14, 110) of the device, from a first position toward a second position separate from the first position, - first blocking means (46, 102, 118) cooperating mechanically with the movable means (24, 112) such that a movement of the movable means from the first position to the second position causes a movement of the first blocking means from a non-blocking position to a blocking position, the non-blocking position being a position in which the first blocking means authorize a movement of the output member from the non-detection position to the detection position, and the blocking position being a position in which the first blocking means prevent a movement of the output member from the non-detection position to the detection position, - second blocking means (52, 60a, 60b) movable under the effect of a centrifugal force (F2, F1) induced by the rotational movement of the chassis, from a retention position to a release position, the retention position being a position in which the second blocking means prevent a movement of the output member from the non-detection position toward the detection position, and the release position being a position in which the second blocking means authorize a movement of the output member from the non-detection position toward the detection position, the movable means (24, 112), and the first (46, 102, 118) and second blocking means (52, 60a, 60b) being configured such that a movement of the output member from the non-detection position to the detection position indicates that the speed of the rotational movement of the chassis has exceeded a rotational speed threshold before the first blocking means have reached the blocking position.