The invention relates to a support structure for a wind turbine, the support structure including: a base including a support used for at least one part of a yaw mechanism, the yaw mechanism connects the base to a tower frame of the wind turbine and enables the base to rotate around a vertical axial line passing through the tower frame. The base includes a hole being adapted with the upper part of hte wind turbine, a plurality of mounting benches, which receives mounting legs of a bearing housing. The bearing housing supports a rotor shaft. A first column extends between a first pair of the mounting benches and transversally passes through the hole, and a second column extends between a second pair of the mounting benches and is crossed with the first column.