Sliding-type tripod-shaped constant-velocity universal joint

A sliding-type tripod-shaped constant-velocity universal joint comprising:

• an outer race being formed as a cylindrical shape whose inner peripheral surface is provided with three roller grooves that extend in an axial direction thereof;
• a tripod being equipped with a boss portion to be connected to a shaft, and three tripod-shaft portions being disposed upright so as to extend from an outer peripheral surface of said boss portion outward in a diametric direction of said boss portion respectively and being inserted into each of said roller grooves;
• and
• rollers being formed as an annular shape, being supported to said tripod-shaft portions rotatably with respect to said tripod-shaft portions, and additionally being inserted into said roller grooves rollably by fitting;
• wherein a shaft-axis-wise width of said tripod-shaft portions is formed smaller as it goes from the root side to the leading-end side in a torque transmission region of said tripod-shaft portions;
• and
• a torque-transmission-wise width of said tripod-shaft portions is formed greater as it goes from the root side to the leading-end side in said torque transmission region when defining a direction that intersects with said shaft axis and said tripod-shaft portions orthogonally as a torque transmission direction.