A spokesman said Miliband, 43, suffered the injury while walking on a coastal path in Devon with wife Justine when he fell, hitting his left wrist on a rock.
However, it was only when he attended the accident and emergency unit at University College Hospital here on Friday as the pain in his wrist was not subsiding that an X-ray revealed he had suffered a fracture.
On doctor's advice, he returned to the hospital yesterday for a minor operation to re-set the wrist.
It is understood that he required painkillers when he delivered his tribute to the former prime minister in the Commons last week.
After the operation, Miliband tweeted: "Thanks to all of the brilliant, friendly, dedicated staff today at University College hospital who helped treat my broken wrist #lovetheNHS.
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