Abstract: The device is of the type comprising a steering column support structure (1) connected to the rest of the structure of the vehicle and comprising two side members (2,3) between which the column is disposed, and means for fixing the column in position by urging the side walls together and comprising a rod (10) extending through and between the side members and having a first end portion (11) bearing against one of the side members and a second end portion connected to eccentric fixing means (12) provided with at least one eccentric cam (13,17) connected to an actuating lever (14) and to the second end portion (15) of the rod (10) and bearing against the other side member of the support structure for urging the side members together and thereby fixing the column in position. The at least one eccentric cam (13,17) comprises a central core (13a,17a) on which is rotatively mounted a rolling ring (13b,17b) bearing against the corresponding side member.