A railcar comprising: a dual-structure storage box, the dual-structure storage box being positioned along an interior member located inside a carbody of the railcar and being provided at a case receiving frame fixed to a floor or ceiling plate located inside the carbody; a device receiver case including a device receiving member at which a device unit (41, 43) is placed and a pair of side walls (26, 27); and a storage case configured to cover the device unit (41, 43) and the device receiver case from an outer side of the device unit (41, 43) and the device receiver case and including at least an upper surface portion or lower surface portion, a front surface portion, and a side surface portion, wherein: both end portions of the device receiving member respectively include overlapping portions (31, 32) respectively formed along the side walls (26, 27) and respectively coupled to side surfaces of the side walls (26, 27); characterized in that the side walls (26, 27) respectively include attachment legs (28, 29) respectively formed by bending lower end portions of the side walls (26, 27) and coupled to the case receiving frame; and an attaching portion (61 to 63) formed by bending a lower end portion of the front surface portion of the storage case is coupled to the case receiving frame, and an attaching portion (61 to 63) formed by bending an end portion of the side surface portion of the storage case is coupled to a side bodyshell of the railcar or the interior member. a dual-structure storage box, the dual-structure storage box being positioned along an interior member located inside a carbody of the railcar and being provided at a case receiving frame fixed to a floor or ceiling plate located inside the carbody; a device receiver case including a device receiving member at which a device unit (41, 43) is placed and a pair of side walls (26, 27); and a storage case configured to cover the device unit (41, 43) and the device receiver case from an outer side of the device unit (41, 43) and the device receiver case and including at least an upper surface portion or lower surface portion, a front surface portion, and a side surface portion, wherein: both end portions of the device receiving member respectively include overlapping portions (31, 32) respectively formed along the side walls (26, 27) and respectively coupled to side surfaces of the side walls (26, 27); characterized in that the side walls (26, 27) respectively include attachment legs (28, 29) respectively formed by bending lower end portions of the side walls (26, 27) and coupled to the case receiving frame; and an attaching portion (61 to 63) formed by bending a lower end portion of the front surface portion of the storage case is coupled to the case receiving frame, and an attaching portion (61 to 63) formed by bending an end portion of the side surface portion of the storage case is coupled to a side bodyshell of the railcar or the interior member. both end portions of the device receiving member respectively include overlapping portions (31, 32) respectively formed along the side walls (26, 27) and respectively coupled to side surfaces of the side walls (26, 27); characterized in that the side walls (26, 27) respectively include attachment legs (28, 29) respectively formed by bending lower end portions of the side walls (26, 27) and coupled to the case receiving frame; and an attaching portion (61 to 63) formed by bending a lower end portion of the front surface portion of the storage case is coupled to the case receiving frame, and an attaching portion (61 to 63) formed by bending an end portion of the side surface portion of the storage case is coupled to a side bodyshell of the railcar or the interior member.