Adjusting device for adjusting a structure, preferably an elongated structure such as a lamppost, relative to a support, said adjusting device comprising: - a first carriage, a second carriage, a third carriage and an elongated base for translating said first carriage along said elongated base in a longitudinal direction relative to said elongated base and relative to said second carriage, wherein said first carriage, said second carriage and said third carriage are connected to said elongated base; - a first coupling arrangement coupling said first carriage to said second carriage via a first abutment element, wherein said first abutment element is arranged for abutment against said structure or said support for said adjusting in an active position, wherein said first abutment element, in dependence of said translating of said first carriage relative to said elongated base and relative to said second carriage in said longitudinal direction, displaces in a direction transversal to said longitudinal direction for abutting said first abutment element against said structure or said support for said adjusting in said active position; - a second coupling arrangement coupling said second carriage to said third carriage via a second abutment element, wherein said second abutment element is arranged for abutment against said structure or said support for said adjusting in said active position, wherein said second abutment element, in dependence of said translating of said first carriage relative to said elongated base and relative to said third carriage in said longitudinal direction, displaces in said direction transversal to said longitudinal direction for abutting said second abutment element against said structure or said support for said adjusting in said active position, wherein said second coupling arrangement comprises a third coupling organ for coupling said second abutment element to said second carriage and comprises a fourth coupling organ for coupling said second abutment element to said third carriage; wherein said first carriage is arranged for translation in said longitudinal direction relative to said second carriage and relative to said third carriage and wherein said second carriage is arranged for translation in said longitudinal direction relative to said first carriage and said third carriage for allowing said first abutment element and said second abutment element to displace in said direction transversal to said longitudinal direction over a different distance. - a first carriage, a second carriage, a third carriage and an elongated base for translating said first carriage along said elongated base in a longitudinal direction relative to said elongated base and relative to said second carriage, wherein said first carriage, said second carriage and said third carriage are connected to said elongated base; - a first coupling arrangement coupling said first carriage to said second carriage via a first abutment element, wherein said first abutment element is arranged for abutment against said structure or said support for said adjusting in an active position, wherein said first abutment element, in dependence of said translating of said first carriage relative to said elongated base and relative to said second carriage in said longitudinal direction, displaces in a direction transversal to said longitudinal direction for abutting said first abutment element against said structure or said support for said adjusting in said active position; - a second coupling arrangement coupling said second carriage to said third carriage via a second abutment element, wherein said second abutment element is arranged for abutment against said structure or said support for said adjusting in said active position, wherein said second abutment element, in dependence of said translating of said first carriage relative to said elongated base and relative to said third carriage in said longitudinal direction, displaces in said direction transversal to said longitudinal direction for abutting said second abutment element against said structure or said support for said adjusting in said active position, wherein said second coupling arrangement comprises a third coupling organ for coupling said second abutment element to said second carriage and comprises a fourth coupling organ for coupling said second abutment element to said third carriage;