This paper deals with an experimental study on suppression of a residual sloshing in a liquid transport container by a bulkhead, which divides the container vertically into two sections. Inserting the bulkhead to the container, the sloshing mode is separated into two modes; the one is the sloshing mode of liquid column in a U-tube (U-tube-mode), and the other is the sloshing mode in the separated container (Bulkhead-mode). In this paper, the suppression effect by the bulkhead on residual sloshing, which is excited by sudden stop of the liquid transport container, is examined experimentally with changing aperture ratio of the bulkhead, types of the bulkhead plate with or without holes, and the size of holes. Moreover, the fluid flow in the container is visualized and the suppression mechanism by the bulkhead is discussed based on the flow visualization. As a result, detailed suppression effect by the bulkhead on the residual sloshing is clarified, and it is clarified that higher suppression effect by the bulkhead is caused by the energy dissipation due to the vortex generated at the edge of the bulkhead and swirl flow in the liquid. The vortex generated and swirl flow in the liquid play an important role in higher energy dissipation of sloshing.