Towing device for a vehicle equipped with a rear access ramp mounted so as to pivot in relation to a body of the vehicle on hinges having a horizontal axis, or ramp axis, the towing device comprising a hook which is integrally locked to a carrier which is designed to be mounted so as to be able to pivot in relation to the body, in which device: - the carrier takes the form of a block on which the hook is fixed, the block being designed to be mounted so as to be able to pivot in relation to the body on a pivot shaft of the carrier which is designed to be mounted coaxially with the axis of the ramp, and - the carrier is designed to be connected to the body through the intermediary of at least one toggle joint formed by two rods (14a, 14b) articulated with one another on a first shaft, a first rod being articulated in relation to the body on a second shaft, the device being characterised in that a second rod is articulated in relation to the carrier on a third shaft disposed underneath the pivot shaft, the first, second and third shafts all being parallel with the pivot shaft of the carrier, and - the second rod carries at least one lug abutting against at least one control element integrally locked to the ramp and disposed between the pivot shaft of the carrier and the third shaft, and - the positions of the different shafts are chosen such that when the device is fixed to a vehicle the ramp of which is closed, the carrier of the hook is substantially vertical and the rods (14a, 14b) form an angle (α) of less than 180°, the triangle the vertices of which are the geometric axes (15', 16', 18') of the first, second and third shafts thus having its vertex corresponding to the first shaft which is oriented towards the pivot shaft of the carrier, and - the opening of the ramp causes, through the intermediary of the control element or elements, the opening of the toggle joint with an angle (α) of the rods (14a, 14b) greater than 180°, the triangle the vertices of which are the geometric axes (15', 16', 18') of the first, second and third shafts thus having its vertex corresponding to the first shaft which is oriented in the opposite direction to the pivot shaft of the carrier, the ramp also cooperating when opened with a stop of the carrier of the hook leading to the pivoting of the carrier with the ramp. - the carrier takes the form of a block on which the hook is fixed, the block being designed to be mounted so as to be able to pivot in relation to the body on a pivot shaft of the carrier which is designed to be mounted coaxially with the axis of the ramp, and - the carrier is designed to be connected to the body through the intermediary of at least one toggle joint formed by two rods (14a, 14b) articulated with one another on a first shaft, a first rod being articulated in relation to the body on a second shaft, - the second rod carries at least one lug abutting against at least one control element integrally locked to the ramp and disposed between the pivot shaft of the carrier and the third shaft, and - the positions of the different shafts are chosen such that when the device is fixed to a vehicle the ramp of which is closed, the carrier of the hook is substantially vertical and the rods (14a, 14b) form an angle (α) of less than 180°, the triangle the vertices of which are the geometric axes (15', 16', 18') of the first, second and third shafts thus having its vertex corresponding to the first shaft which is oriented towards the pivot shaft of the carrier, and - the opening of the ramp causes, through the intermediary of the control element or elements, the opening of the toggle joint with an angle (α) of the rods (14a, 14b) greater than 180°, the triangle the vertices of which are the geometric axes (15', 16', 18') of the first, second and third shafts thus having its vertex corresponding to the first shaft which is oriented in the opposite direction to the pivot shaft of the carrier, the ramp also cooperating when opened with a stop of the carrier of the hook leading to the pivoting of the carrier with the ramp.