An electrical device cabinet includes a cabinet body, a front panel, and a positioning mechanism. The cabinet body has an open front end. The front panel is formed by a resin molding, and is mounted to the front end of the cabinet body. The positioning mechanism includes a concave portion disposed at the cabinet body and a convex portion disposed at an inner face of the front panel. The positioning mechanism positions the front panel in a lateral direction with respect to the cabinet body by mating the concave portion and the convex portion. The convex portion is formed in a hollow shape and is covered by an outer face of the front panel from a front side of the front panel.