To improve durability of a yoke 23, by relieving stress acting on a continuous part 31, with a structure that a slit 29 and the continuous part 31 exist in a base part 24 of the yoke 23 of a universal joint.

A recessed part 25 recessed to the outer diameter side is formed in a part being the substantially same phase as the slit 29 in the circumferential direction among an inner peripheral surface of this continuous part 31. Rigidity of this part is reduced more than the other part. Stress acting when further fastening by threadedly engaging a nut with a bolt inserted into a pair of through-holes 28 arranged in the base part 24, and stress acting when transmitting rotation of mutual both rotary shafts respectively fixed to both end parts of the universal joint, are relieved by elastically deforming a part of forming the recessed part 25.

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