To provide a nozzle driving device having simple constitution for preventing rotational failure of an annular member and favorably driving a nozzle vane.

The nozzle driving device 10 has a plurality of the nozzle vanes 15 rotatably provided and the annular member 12 for rotating the nozzle vanes 15 around a rotary shaft O1 through an interlocking mechanism 14 by the turning and support pins 16 for supporting the annular member 12 and a driving rod 17 for rotating the annular member 12. When the four support pins 16 are annularly arranged at equal intervals around a central axis line O2 of an imaginary circle C passing the rotary shaft O1 of the nozzle vanes 15 and the annular member 12 abuts on one support pin 16 provided face to face, an aperture X is formed between the other support pin 16 and the annular member 12.