A curved-hole drilling by electrical discharge machining (EDM) using a suspended ball electrode composed of a metal ball and flexible thin foil has been developed, and it was clarified that curved-holes and bended-holes with various curving and bending angles into various workpiece materials could be machined by controlling the tilting angle of workpiece during the process. However, bended-hole with bending angle over 45° and curved-hole with drilling hole depth over 80 mm have not yet been tried so far. For further wide practical application of this method, the curved hole EDM drillings with large bending angle and with hole depth were experimentally investigated in this report. In EDM drilling of a straight hole into aluminum alloy using a electrode ball of 10 mm in diameter, the drilling performance was very stable. Bended-holes with large bending angle, such as right-angle (90°), could be accurately formed by using a foil-supporting jig. Additionally, various bended holes with large bending angles were suceeded by controlling the tilting angle of workpiece. Furthermore, when a suspended ball electrode with very long foil over 600mm was used for drilling deep curved-hole, a very deep curved-hole of 500 mm length with 16° curving angle was successfully drilled.