A connecting device for mating and connection on the sea bed of a first and second pipeline having respective first and second pipe ends (E 1; E 2) at the connection point, comprising: a first connecting part retaining the first pipe end (E 1) of a first pipeline, said first connecting part and said first pipeline are designed to be lowered and deployed on the seabed in advance of the mating and connection, said first connecting part further comprising a guide structure arranged a distance apart from the first pipe end (E 1), a second submersible connecting part retaining the second end (E 2) of the second pipeline, said second connecting part and said second pipeline are designed to be lowered from the surface towards the first connecting part, said second connecting part comprising a guide device arranged a distance apart from the second pipe end (E 2), and a connector being arranged between the connecting parts (1, 2) for final connection between the pipe ends (E 1; E 2), wherein the guide device is configured to cooperate with the guide structure during lowering of the second connecting part towards the first connecting part and further pivots the second connecting part into coarse alignment of the second pipe end (E 2) in a direction towards the first pipe end (E 1) such that the first and second pipelines are brought to coarsely align with each other on the sea bed, characterized in that the connecting device further comprises a ramp structure located close to or adjacent the first connecting part, said ramp structure having abutment surfaces (6b, 6c, 6d, 6e, 6f) comprising ramp surfaces, and plate parts engaging respectively with contact surfaces and notches on the second connecting part when the second connecting part is advanced towards the first connecting part, said notches are in engagement with the plate parts at the same time as the contact surfaces are lifted by the ramp surface during advancement of the second connecting part towards the first connecting part in order to provide fine alignment between the pipe ends (E 1, E 2) before the connection itself is made up and to prevent the second connecting part with the second pipeline to tilt or withdraw relative to the first connecting part. a first connecting part retaining the first pipe end (E 1) of a first pipeline, said first connecting part and said first pipeline are designed to be lowered and deployed on the seabed in advance of the mating and connection, said first connecting part further comprising a guide structure arranged a distance apart from the first pipe end (E 1), a second submersible connecting part retaining the second end (E 2) of the second pipeline, said second connecting part and said second pipeline are designed to be lowered from the surface towards the first connecting part, said second connecting part comprising a guide device arranged a distance apart from the second pipe end (E 2), and a connector being arranged between the connecting parts (1, 2) for final connection between the pipe ends (E 1; E 2), wherein the guide device is configured to cooperate with the guide structure during lowering of the second connecting part towards the first connecting part and further pivots the second connecting part into coarse alignment of the second pipe end (E 2) in a direction towards the first pipe end (E 1) such that the first and second pipelines are brought to coarsely align with each other on the sea bed, characterized in that the connecting device further comprises a ramp structure located close to or adjacent the first connecting part, said ramp structure having abutment surfaces (6b, 6c, 6d, 6e, 6f) comprising ramp surfaces, and plate parts engaging respectively with contact surfaces and notches on the second connecting part when the second connecting part is advanced towards the first connecting part, said notches are in engagement with the plate parts at the same time as the contact surfaces are lifted by the ramp surface during advancement of the second connecting part towards the first connecting part in order to provide fine alignment between the pipe ends (E 1, E 2) before the connection itself is made up and to prevent the second connecting part with the second pipeline to tilt or withdraw relative to the first connecting part.