A vehicle body structure comprising: a bumper reinforcement that is arranged on an end portion of a vehicle body in a vehicle longitudinal direction so that a longitudinal direction of the bumper reinforcement is set along a vehicle width direction; a side member that is arranged, at a vehicle width direction outside portion of the bumper reinforcement, on a vehicle longitudinal direction cabin side with respect to the bumper reinforcement so that a longitudinal direction of the side member is set along the vehicle longitudinal direction, and that is formed with i) a closed section portion of which a cross section when the closed section portion is cut along the vehicle width direction forms a closed section, and ii) a protruding portion that protrudes from the closed section portion toward the bumper reinforcement side; and a bumper stay that connects the side member to the bumper reinforcement, and that forms, together with the protruding portion, an open section portion of which a cross section when the open section portion is cut along the vehicle width direction forms an open section, characterized by comprising a first weak portion formed on one side in the vehicle width direction of the closed section portion; and a second weak portion formed on the other side in the vehicle width direction of the open section portion, wherein a connecting wall portion (24, 44) that connects the first weak portion with the second weak portion is formed on the side member; and a load transmitting portion that is fixed to the connecting wall portion (24, 44) and that is formed with an extending edge portion that extends from the second weak portion side toward the first weak portion side is formed on the bumper stay. a bumper reinforcement that is arranged on an end portion of a vehicle body in a vehicle longitudinal direction so that a longitudinal direction of the bumper reinforcement is set along a vehicle width direction; a side member that is arranged, at a vehicle width direction outside portion of the bumper reinforcement, on a vehicle longitudinal direction cabin side with respect to the bumper reinforcement so that a longitudinal direction of the side member is set along the vehicle longitudinal direction, and that is formed with i) a closed section portion of which a cross section when the closed section portion is cut along the vehicle width direction forms a closed section, and ii) a protruding portion that protrudes from the closed section portion toward the bumper reinforcement side; and a bumper stay that connects the side member to the bumper reinforcement, and that forms, together with the protruding portion, an open section portion of which a cross section when the open section portion is cut along the vehicle width direction forms an open section, characterized by comprising a first weak portion formed on one side in the vehicle width direction of the closed section portion; and a second weak portion formed on the other side in the vehicle width direction of the open section portion, wherein a connecting wall portion (24, 44) that connects the first weak portion with the second weak portion is formed on the side member; and a load transmitting portion that is fixed to the connecting wall portion (24, 44) and that is formed with an extending edge portion that extends from the second weak portion side toward the first weak portion side is formed on the bumper stay.