A vehicle body upper structure includes: roof side rails; side outer panels; and a roof panel made of a material different from a martial of the roof side rails. The roof panel and the paired left and right side outer panels are fixed to one another by braze joining. An end portion of the roof panel in a vehicle front-rear direction includes a first coupling portion in which one of the roof side rails, the roof panel, and one of the side outer panels are coupled to one another, a notch portion that is provided on the inner side in the vehicle width direction of the first coupling portion, and a fragile portion that extends from a tip end portion of the notch portion toward a braze joining portion of the side outer panel and the roof panel.