Vortex levitation can achieve non-contact handling by blowing air into a vortex cup through a tangential nozzle to generate a swirling flow. In this paper, we focused on the relationship between the sucking pressure and the flow dynamics when gap distance from the cup to a work piece changes. Then simultaneous measurement of a pressure and a flow field in the cup was performed. As a result, the mean pressure changes and the pressure fluctuation inside the cup enhances with increasing the gap height. Especially, periodic pressure perturbation is observed with wide gap height and it synchronizes with the eccentric rotation of the swirling flow. It is also found that the rotation axis of swirling flow steadily-inclines against the central axis of the cup for appropriate gap height.

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