The present invention provides a thread wound golf ball which keeps a good shot feel inherently present in thread wound golf balls and attains a long flight distance which is equal to that attained by a two-piece solid golf ball. The thread wound golf ball comprises a centre comprising a vulcanized moulded article of a rubber composition, a thread rubber layer formed on the centre and a cover covering the thread rubber layer, wherein the centre has a diameter of 30 to 35 mm and wherein a strain amount formed between an initial loading of 10 kg and a final loading of 30 kg is 1.2 to 2.5 mm.