This paper discusses "VmaxCarrier2", an omni-directional mobile robot with step-climbing capability, which can be used as a compact, quiet, and durable transportation vehicle in cluttered and cramped environments. We have already developed several kinds of omni-directional mobile robots for situations where it is desirable to be able to move in all directions, such as "VUTON" and "VmaxCarrier". To construct an omni-directional mobile robot with a greatly improved capability to climb steps, we developed the Omni-Disc2, a Bent Pneumatic Actuator, and a pneumatic system. These novel components were constructed into a prototype. We show the basic working principle and feature of omni-based on the patent (#2003-326912, #2004-131017) and explain the expected market with business model.