Abstract: A double skin structure of a railcar bodyshell includes: a harmonica type structural portion in which a closed space is quadrangular when viewed from a car longitudinal direction; and a truss type structural portion which is located adjacent to the harmonica type structural portion and in which a closed space is triangular when viewed from the car longitudinal direction. A thickness reduced portion is formed in at least one of a region between a car width direction middle portion of a roof bodyshell and a car body circumferential direction middle portion of a cantrail. The thickness reduced portion having a bodyshell thickness that is made small by arranging an inner wall of the thickness reduced portion at a car exterior side of the inner wall of a region adjacent to the region in which the thickness reduced portion is formed.

Abstract: A double skin structure of a railcar bodyshell includes: a harmonica type structural portion in which a closed space is quadrangular when viewed from a car longitudinal direction; and a truss type structural portion which is located adjacent to the harmonica type structural portion and in which a closed space is triangular when viewed from the car longitudinal direction. A thickness reduced portion is formed in at least one of a region between a car width direction middle portion of a roof bodyshell and a car body circumferential direction middle portion of a cantrail. The thickness reduced portion having a bodyshell thickness that is made small by arranging an inner wall of the thickness reduced portion at a car exterior side of the inner wall of a region adjacent to the region in which the thickness reduced portion is formed.