A bicycle-carrier device includes a brace for connection to the frame of a vehicle, and bearing supporting elements to support one or more bicycles oriented transversely relative to the vehicle. The brace consists of a transverse bar, and the bicycles are supported by at least first and second supporting elements affixed to the bar, in positions that can be adjusted along the bar, so as to receive and support from below the two wheels of a bicycle. Mounted on the bar in an articulated manner is an arm that can be shifted between a raised operating position and a lowered non-operating position. Secured to the bar in an adjustable manner is at least one third supporting element that receives and supports from below an element of a bicycle frame. Each of the supporting elements is provided with means for locking in place the part that is received.