The present study experimentally investigates gas-liquid two-phase flow in a Taylor vortex flow device with a ribbed rotor. In this device, a pair of counter-rotating vortices appears between two ribs. This device immobilizes and stabilizes vortices even in gas-liquid two-phase flow. Mean residence time of gas obtained from gas hold-up largely increased when the ribbed rotor was employed. It is found that more bubbles were captured when wider ribs were employed. Furthermore, an increase in rib width can intense the downward flow generated under the ribs owing to the high centrifugal force. The mean diameter of bubbles also increases with rotational speed of rotor. It is, therefore, found that the interfacial area between gas and liquid has a peak value against the rotational number.