A power transmission device for a vacuum interrupter, the device comprising: a driving link coupled to an adjuster for adjusting a movable electrode of a vacuum interrupter; a driven link coupled to the movable electrode 5 of the vacuum interrupter; connection links and configured to connect the driving link and the driven link with each other, and coupled to the driving link and the driven link such that an interval between the driving link and the driven link is varied as a plurality of links (32, 36, 33 37) are foldable with respect to each other; cams (41, 45) coupled to the connection links (31, 35) in a perpendicular direction; and cam guides (51, 55) having guide recesses (52, 53, 56, 57) for slidably coupling the cams (41, 45), and configured to guide the interval between the driving link and the driven link to be changed, by selectively folding the connection links (31, 35) as the cams (41, 45) advance on their path, characterized in that the guide recesses (52, 53, 56, 57) include: first recess portions (521, 531, 561, 571) formed in parallel to the movable electrode; second recess portions (522, 532, 562, 572) formed at the ends of the first recess portions (521, 531, 561, 571) of the movable electrode side, in a curved or inclined shape so as to be widened towards the movable electrode; and third recess portions (523, 533, 563, 573) formed at the ends of the second recess portions (522, 532, 562, 572) of the movable electrode side, in a curved or inclined shape towards the adjuster-side ends of the first recess portions. a driving link coupled to an adjuster for adjusting a movable electrode of a vacuum interrupter; a driven link coupled to the movable electrode 5 of the vacuum interrupter; connection links and configured to connect the driving link and the driven link with each other, and coupled to the driving link and the driven link such that an interval between the driving link and the driven link is varied as a plurality of links (32, 36, 33 37) are foldable with respect to each other; cams (41, 45) coupled to the connection links (31, 35) in a perpendicular direction; and cam guides (51, 55) having guide recesses (52, 53, 56, 57) for slidably coupling the cams (41, 45), and configured to guide the interval between the driving link and the driven link to be changed, by selectively folding the connection links (31, 35) as the cams (41, 45) advance on their path, characterized in that the guide recesses (52, 53, 56, 57) include: first recess portions (521, 531, 561, 571) formed in parallel to the movable electrode; second recess portions (522, 532, 562, 572) formed at the ends of the first recess portions (521, 531, 561, 571) of the movable electrode side, in a curved or inclined shape so as to be widened towards the movable electrode; and third recess portions (523, 533, 563, 573) formed at the ends of the second recess portions (522, 532, 562, 572) of the movable electrode side, in a curved or inclined shape towards the adjuster-side ends of the first recess portions. first recess portions (521, 531, 561, 571) formed in parallel to the movable electrode; second recess portions (522, 532, 562, 572) formed at the ends of the first recess portions (521, 531, 561, 571) of the movable electrode side, in a curved or inclined shape so as to be widened towards the movable electrode; and third recess portions (523, 533, 563, 573) formed at the ends of the second recess portions (522, 532, 562, 572) of the movable electrode side, in a curved or inclined shape towards the adjuster-side ends of the first recess portions.