There is provided a roof structure of a vehicular body. The roof structure includes right and left side roof rails disposed on opposing sides of the vehicular body. The roof structure further includes a plurality of roof reinforcements installed in a spaced-apart relationship between the side roof rails and extending along a lateral direction across the vehicular body and a roof panel attached to the roof reinforcements, wherein at least one roof reinforcement of the plurality of roof reinforcements is a first roof reinforcement having a maximum width portion wider than a closest relative spacing between the first roof reinforcement and an adjacent roof reinforcement of the plurality of roof reinforcements on a first side of the first roof reinforcement.