A vehicle body end section structure comprising: a pair of framework members, that are each long in a vehicle front-rear direction, that are disposed side-by-side in a vehicle width direction, and that include leading end sides configured as energy absorption sections; a bumper framework section that is long in the vehicle width direction, that is connected to leading end portions of the pair of framework members, and that has both ends in the vehicle width direction configured as jutting-out portions jutting out to a vehicle width direction outside of the pair of framework members; a spacer member that projects out from one of the jutting-out portions to a framework member side; and a slide permitting structure that is configured to permit sliding of the end portion of the spacer member on the framework member side in the vehicle front-rear direction with respect to the side face of the framework member, wherein the slide permitting structure comprises either a non-coupled structure, in which the end portion of the spacer member on the framework member side is not coupled to the framework member, or a coupled structure, in which the spacer member is coupled to the framework member such that the coupling of the spacer member with respect to the framework member is released by input of load of a specific value or above to the one of the jutting-out portions, wherein the spacer member is formed to be inclined or to be curved such that a portion of the spacer member on a side of the one of the jutting-out portions is positioned further to a vehicle width direction outside than a portion of the spacer member on a framework member side, and an end portion of the spacer member on the framework member side configures an opposing face facing a side face of the framework member, characterized in that the bumper framework section comprises: a bumper framework body spanning between the pair of framework members; and an extension member that is fixed at each end in the vehicle width direction of the bumper framework body so as to provide at least portions of the jutting-out portions, and that is made from a stronger material than the bumper framework body; and each of the extension members is provided over a range from the connection location of each extension member with either one of the energy absorption sections to the end of the bumper framework section. a pair of framework members, that are each long in a vehicle front-rear direction, that are disposed side-by-side in a vehicle width direction, and that include leading end sides configured as energy absorption sections; a bumper framework section that is long in the vehicle width direction, that is connected to leading end portions of the pair of framework members, and that has both ends in the vehicle width direction configured as jutting-out portions jutting out to a vehicle width direction outside of the pair of framework members; a spacer member that projects out from one of the jutting-out portions to a framework member side; and a slide permitting structure that is configured to permit sliding of the end portion of the spacer member on the framework member side in the vehicle front-rear direction with respect to the side face of the framework member, wherein the slide permitting structure comprises either a non-coupled structure, in which the end portion of the spacer member on the framework member side is not coupled to the framework member, or a coupled structure, in which the spacer member is coupled to the framework member such that the coupling of the spacer member with respect to the framework member is released by input of load of a specific value or above to the one of the jutting-out portions, wherein the spacer member is formed to be inclined or to be curved such that a portion of the spacer member on a side of the one of the jutting-out portions is positioned further to a vehicle width direction outside than a portion of the spacer member on a framework member side, and an end portion of the spacer member on the framework member side configures an opposing face facing a side face of the framework member, characterized in that the bumper framework section comprises: a bumper framework body spanning between the pair of framework members; and an extension member that is fixed at each end in the vehicle width direction of the bumper framework body so as to provide at least portions of the jutting-out portions, and that is made from a stronger material than the bumper framework body; and each of the extension members is provided over a range from the connection location of each extension member with either one of the energy absorption sections to the end of the bumper framework section. a bumper framework body spanning between the pair of framework members; and an extension member that is fixed at each end in the vehicle width direction of the bumper framework body so as to provide at least portions of the jutting-out portions, and that is made from a stronger material than the bumper framework body; and each of the extension members is provided over a range from the connection location of each extension member with either one of the energy absorption sections to the end of the bumper framework section.