To provide a rotary power transmitting device, efficiently and sufficiently supplying a lubricant to a required part, in the rotary power transmitting device for transmitting the rotary power of an input shaft to an output shaft whose axis of rotation is arbitrarily eccentric to the axis of rotation of the input shaft, which can be revolved round the periphery of the axis of rotation of the input shaft and be turned on its axis.

This rotary power transmitting device transmits the rotary power of the input shaft 20 to the output shaft 30 whose axis of rotation is arbitrarily eccentric to the axis I of rotation of the input shaft 20, which can be revolved around the periphery of the axis I of rotation of the input shaft 20 and be turned on its axis. An input side plate 26 of an input side holding member 18 and an output side plate 38 of an output side holding member 34 are disposed face to face to thereby form a lubricant supply passage 70 surrounded by a sealing member 68, and the lubricant force-fed through the lubricant supply passage 70 is supplied to an input side rotating roller 22 and an output side rotating roller 36.