A housing of a railway vehicle device includes a reinforcing member and at least one first exterior member. The reinforcing member includes a first support member extending in a X-axis direction, and second support members that are fixed to the first support member while main surfaces are oriented in a direction intersecting the X-axis direction, the second support members being plate-like members. The first exterior members are thin plate-like members that are fixed to side surfaces of the second support members, cover a periphery of the reinforcing member, and form housing surfaces extending along the X-axis direction. In each of the first exterior members, cutouts each are formed extending in a direction intersecting the X-axis direction from the both ends in the direction intersecting the X-axis direction. An opening is formed, by the cutouts, in at least one of the housing surfaces extending along the X-axis direction.