To provide a transmission having small rotation resistance capable of reducing noise for a long period of time.

A first roller 100 for coaxially rotating along a driven gear makes a roll contacts with a second roller 50 for coaxially rotating along a first middle gear. Two ellipse separation rollers 30, 40 structuring the first roller 100 are displaceable in a long axis direction X1 and energized in the long axis direction X1 by energizing springs 71, 72. The second roller 50 is displaceable in a long axis direction Y1 and energized in the long axis direction Y1 by energizing springs 81, 82. A resultant force of pressing forces applied from the two separation rollers 30, 40 to the second roller 50 is constant regardless of a rotation phase .