To perform an effective prevention of occurrence of stick slip sound.
There are provided a hub shaft 7 having a driving shaft 13 inserted thereinto and fixed thereto, and an inner ring 4 fixed to the outer circumference of the hub shaft 7. The inner ring 4 receives a large-diameter part 13b of the driving shaft 13 at its end surface. In such a roll bearing device as described above, a counter-ring side 16b of a connecting part 16 with the hub shaft 7 at the driving shaft 13 is caused to approach an abutting location (B) between the end surface of the inner ring 4 and the large-diameter part 13b of the driving shaft 13 and then a difference in twisting rigidity of the driving shaft 13 at the abutting location (B) and a connecting location (A) at the counter-ring side 16b of the connecting part 16 is decreased.
INOUE SHIGERU
DEGUCHI MASARU
