Power transmission device of steering system

A power transmission device of a steering system, comprising:

• a first connector comprising a cylindrical first support coupled to one of coaxial first and second shafts and first coupling portions extending axially from inner circumferential portions of the first support;
• a second connector comprising a second support coupled to the other of the first and second shafts and fitted into the first support and second coupling portions extending axially from outer circumferential portions of the second support;
• and
• a damper comprising outer support recesses provided in outer circumferential portions thereof, with the first coupling portions being fitted into the outer support recesses, and inner support recesses provided in inner circumferential portions thereof, with the second coupling portions being fitted into the inner support recesses, wherein the damper is coupled between the first connector and the second connector,
• wherein the second connector has a support end portion provided on one end portion thereof facing away from the damper, the support end portion being spaced apart from one end portion of the damper in a position in which the damper is axially coupled to the second connector, and supporting the damper when the first shaft and the second shaft move.