Shock-absorbing caster of traveling suitcase

A shock-absorbing caster structure of traveling suitcase, comprising:

• a caster shell seat having a receiving space therein and fixedly disposed at a bottom edge of a rear side of a traveling suitcase;
• a roller pivotal seat received in said receiving space of said caster shell seat, said roller pivotal seat having an arc-shaped top plate, a left side plate, and a right side plate, said left and right side plates being bent from two sides of said arc-shaped top plate, pivotal holes being respectively disposed at a top of said arc-shaped top plate and on said left and right side plates, said pivotal hole at the top of said arc-shaped top plate matching a pivot to pivotally join said caster shell seat;
• a roller comprising a hub portion and a felly portion disposed at a periphery of said hub portion, said hub portion having a central hole, said central hole matching a pivot to be pivotally joined at said pivotal holes of said left and right side plates of said roller pivotal seat;
• and
• a soft component or resilient body, one side thereof being joined on said arc-shaped top plate of said roller pivotal seat, the other side thereof abutting against an inner edge of said caster shell seat.