Mobile mass suspension system, comprising: - at least one mobile mass, - connection means connecting the mobile mass to another element of the system such as a support or another mobile mass, so as to allow the mobile mass to move in a plane called the "mobility plane", relative to said other element (20, 14) of the system, characterised in that the connection means comprise a first connection device comprising a first connection element connected to the mobile mass, a second connection element connected to said other element of the system (20, 14), and a connection block connecting the first connection element to the second connection element, in which, when the mobile mass is in a rest position, the first and the second connection elements (34A, 36A) are centred with respect to a first plane and a second plane respectively that are orthogonal to the mobility plane and that intersect, in which the first connection element is deformable in bending in the mobility plane so as to enable displacement of the mobile mass relative to the connection block along a first direction orthogonal to the first plane, starting from the rest position, and the second connection element is deformable in bending in the mobility plane to enable relative displacement of said other element of the system (20, 14) relative to the connection block along a second direction orthogonal to the second plane, starting from the rest position, and in which at least one of the first and second connection elements (34A; 36A) is formed from at least two springs (40, 70, 80; 42, 72, 84), each of which having a first end (44; 48) connected to the mobile mass, respectively to said other element of the system (20, 14), and a second end (46; 50) connected to the connection block. - at least one mobile mass, - connection means connecting the mobile mass to another element of the system such as a support or another mobile mass, so as to allow the mobile mass to move in a plane called the "mobility plane", relative to said other element (20, 14) of the system, characterised in that the connection means comprise a first connection device comprising a first connection element connected to the mobile mass, a second connection element connected to said other element of the system (20, 14), and a connection block connecting the first connection element to the second connection element, in which, when the mobile mass is in a rest position, the first and the second connection elements (34A, 36A) are centred with respect to a first plane and a second plane respectively that are orthogonal to the mobility plane and that intersect, in which the first connection element is deformable in bending in the mobility plane so as to enable displacement of the mobile mass relative to the connection block along a first direction orthogonal to the first plane, starting from the rest position, and the second connection element is deformable in bending in the mobility plane to enable relative displacement of said other element of the system (20, 14) relative to the connection block along a second direction orthogonal to the second plane, starting from the rest position, and in which at least one of the first and second connection elements (34A; 36A) is formed from at least two springs (40, 70, 80; 42, 72, 84), each of which having a first end (44; 48) connected to the mobile mass, respectively to said other element of the system (20, 14), and a second end (46; 50) connected to the connection block.