To substantially equally set life of each member composing a multistage roller transmission device without difference.

At least two kinds of roller groups in which a plurality of planetary rollers are rotatably arranged with equal spacings in a circumferential direction are arranged in a space formed between a sun roller and an outer ring, in a radially multistage and pressure contact state. Each planetary roller 23 of the roller group contact with the sun roller having radius of rotation RS is composed of a large diameter part 34 having a rolling surface provided with effective contact width BL and radius of rotation R1L, and a small diameter part 33 having a rolling surface provided with effective contact width BS and radius of rotation R1S. The ratio of effective contact widths of the large diameter part 34 and the small diameter part 33 is set within a range of value obtained by the following formula: BL/BS=A(R1L/RS)3/7x(R1S/RS)29/21, where A is a constant determined by a number (n) of the planetary rollers 23.