The present disclosure provides a vehicle front section structure including: a front side member that extends along a vehicle front-rear direction; a radiator support that is formed in a rectangular frame shape as viewed from a front of the vehicle and is joined to the front side member at a side radiator support configuring a side portion of the radiator support extending along a vehicle up-down direction; and a lower member that extends along the vehicle front-rear direction, that is joined to a vehicle lower side end portion of the radiator support, and that, at a join portion joined with the radiator support, is provided with a deformation origin portion that lets the join portion undergo bending deformation toward a top of the vehicle in a case in which load is input from the front of the vehicle.