During cruise flight at 3500 feet agl, a bird impacted the leading edge of the right wing, inboard of the wing lift strut attach point. The flight instructor did not see the bird until just before it impacted the wing. The CFI evaluated the damage in-flight and decided to continue the flight to his intended destination and landed without further incident. Examination of the right wing revealed the leading edge was crushed aft and two internal wing ribs were damaged.