A vehicle body front section structure comprising: a suspension member that supports left and right suspension devices, and that is coupled to an engine disposed in a vehicle body front section; a pair of left and right front side support portions that respectively support left and right front side portions of the suspension member from a vehicle body; a pair of left and right rear side support portions that respectively support left and right rear side portions of the suspension member from the vehicle body; characterized in that the vehicle body front section structure comprises: coupling members that are provided in a vehicle front-rear direction between the pair of left and right front side support portions and the pair of left and right rear side support portions, and that are provided in a vehicle width direction between the front side support portion and rear side support portion on a vehicle left side, and the front side support portion and rear side support portion on a vehicle right side, each of the coupling members comprising a plate shaped portion that is fixed to the suspension member and that extends in a vehicle top-bottom direction with a plate thickness direction of the plate shaped portion oriented in the vehicle front-rear direction, and a fixing portion that is fixed to the vehicle body and that extends from a top end portion of the plate shaped portion towards a vehicle rear side or a vehicle front side. a suspension member that supports left and right suspension devices, and that is coupled to an engine disposed in a vehicle body front section; a pair of left and right front side support portions that respectively support left and right front side portions of the suspension member from a vehicle body; a pair of left and right rear side support portions that respectively support left and right rear side portions of the suspension member from the vehicle body; characterized in that the vehicle body front section structure comprises: coupling members that are provided in a vehicle front-rear direction between the pair of left and right front side support portions and the pair of left and right rear side support portions, and that are provided in a vehicle width direction between the front side support portion and rear side support portion on a vehicle left side, and the front side support portion and rear side support portion on a vehicle right side, each of the coupling members comprising a plate shaped portion that is fixed to the suspension member and that extends in a vehicle top-bottom direction with a plate thickness direction of the plate shaped portion oriented in the vehicle front-rear direction, and a fixing portion that is fixed to the vehicle body and that extends from a top end portion of the plate shaped portion towards a vehicle rear side or a vehicle front side. coupling members that are provided in a vehicle front-rear direction between the pair of left and right front side support portions and the pair of left and right rear side support portions, and that are provided in a vehicle width direction between the front side support portion and rear side support portion on a vehicle left side, and the front side support portion and rear side support portion on a vehicle right side, each of the coupling members comprising a plate shaped portion that is fixed to the suspension member and that extends in a vehicle top-bottom direction with a plate thickness direction of the plate shaped portion oriented in the vehicle front-rear direction, and a fixing portion that is fixed to the vehicle body and that extends from a top end portion of the plate shaped portion towards a vehicle rear side or a vehicle front side.