VEHICLE BODY UPPER STRUCTURE

The present invention provides a vehicle body upper structure capable of efficiently mitigating an impact. A front roof rail (4) extends in the vehicle width direction in the longitudinal direction, and integrally has a substantially flat general surface (20), a leading edge flange section (21) provided to the leading edge of the general surface (20), and a trailing edge flange section (22) provided to the trailing edge of the general surface (20). The general surface (20) is provided with a deformation promoting opening (42) which is provided continuously with the deformation opening main body (41) of the deformation opening part (40) and sets the dimension in the front-rear direction of the vehicle to be short. The deformation promoting opening (42) is provided with a plurality of deformation promoting holes. The deformation promoting opening (42) is formed in a substantially triangular shape so as to extend toward the front side of the mounting seat surface (30) such that the apex portion thereof extends t