The invention relates to harbour equipment for increasing the accommodation capacity of a marina. The equipment is attached to a wharf or a pontoon (1) of the harbour and defines a dedicated location (2) for the parking of a first ship. The equipment includes a lift structure (3) with a first driving means (5) and connected to the wharf, as well as a nacelle (4) carried by said lift structure (3) and adapted for receiving a second ship to be parked, at least said nacelle (4) being mobile between an end low submerged position in which the same is located in the vicinity of the location (2) and an end high emerged position, the movement of the nacelle (4) from one position to the other being a translational movement. The lift structure includes two deformable parallelograms (35) and the driving means (5) includes, for example, floats (355) arranged as a ballast and acting on the deformable parallelograms.
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