Ms Gillard was entering the ABC studios in East Perth about 9.30am (WST) on Friday when a man threw the egg, missing her and hitting a policewoman in the back.
Police swiftly subdued a 55-year-old man from North Beach in the city's north.
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The man has been served with a summons to face court on a charge of common assault over the incident, WA police say.
The man is due to appear in Perth Magistrates Court on August 18.
Ms Gillard laughed off Friday's egg-throwing incident and apologised to the policewoman who was splattered instead of her.
Police have said the arrested man, a small business owner, was upset with government policy on pay rates for employees.
