The invention relates to a device for assisting at least one movement of a wrist of a user, remarkable in that it comprises : - a forearm shell (2) configured to be worn on the user's forearm; - a hand shell (1) configured to be worn around the palm of the forearm hand; - at least one sensor (50) positioned to detect and quantify at least one rotational movement of the wrist along a determined plane, the sensor (50) being able to transmit movement information to a control unit (51) connected to the sensor (50); - at least one linear actuator (30) positioned in the determined plane and fixed, on the one hand, on the forearm shell (2) and, on the other hand, on the hand shell (1); the linear actuator (30) being able to pass, by being actuated by the control unit (51) in response to the movement information transmitted by the sensor (50), from a lying position to a shortened position, thus causing the hand shell (1) in a rotational movement along the determined plane so as to assist the movement of the wrist. Figure for the abstract: Fig. 1
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