Vehicular upper-part structure includes left and right side roof rails located on opposite sides of a roof of a vehicle compartment, and a roof panel and roof arch member each joined at their opposite end portions to the side roof rails. Each of the side roof rails includes: an outer member; an inner member extending along the outer member, the inner member having a first vertical wall portion and a welding flange portion formed integrally with the first vertical wall portion, one of the opposite end portions of the roof arch member being joined to the welding flange portion by welding; and a second vertical wall portion formed by a stay member that is joined at its one end portion to the welding flange portion and supports a roof panel joint section having the roof panel joined thereto by welding.