The vibration control device is equipped in the rotating machine in which a primary yoke (11) is provided within a hollow space of a secondary yoke (12) so that the secondary yoke rotates about a shaft (1) inserted through the primary yoke. The vibration control device (10) comprises a plurality of electromagnet portions (11₁-11₈,13₁-13₈) arranged around a peripheral surface of the primary yoke, a pair of sensors (14x,14y) and a control portion (15). As the electromagnet portions, there are at least provided a pair of first and second (13₃,13₄,13₇,13₈) electromagnet portions and another pair of third and fourth (13₁,13₂,13₅,13₆) electromagnet portions. The first electromagnet portion (13₃,13₄) is arranged opposite to the second electromagnet portion (13₇,13₈) with respect to an X-axis direction, while the third electromagnet portion (13₁,13₂) is arranged opposite to the fourth electromagnet portion (13₅,13₆) with respect to a Y-axis direction. One sensor (14x) detects a positional displacement between the primary (11) and secondary yokes (12) with respect to the X-axis direction, while another sensor (14y) detects a positional displacement between the primary (11) and secondary yokes (12) with respect to the Y-axis direction. Herein, the positional displacement detected by one sensor (14x) is controlled to be reduced by controlling electric currents supplied to the first (13₃,13₄) and second electromagnet (13₇,13₈) portions, while the positional displacement detected by another sensor (14y) is controlled to be reduced by controlling electric currents supplied to the third (13₁,13₂) and fourth (13₅,13₆) electromagnet portions. By electromagnetically controlling the positional displacement between the primary (11) and secondary yokes (12) with respect to each of the axial directions, the vibration of the shaft (1) is eventually reduced.