Several emergency ambulance crews were sent to Gorleston Beach after horrified eyewitnesses put in more than a dozen calls 999 calls just after 11am.
The young patient was rushed to the James Paget Hospital "in a serious medical condition", but died shortly after arrival.
Officers were called to Lower Esplanade around 11.15am following reports a child had been thrown from a bouncy castle.
The young girl was taken to the James Paget Hospital; however sadly died.
Next of kin have been informed and are being supported by specialist officers.
A joint investigation between the Health and Safety Executive (HSE), local authority and police has been launched to establish the circumstances surrounding the incident and a police cordon has been put in place at the scene whilst enquiries continue." SHARE THIS STORY USING ANY OF THE BUTTON BELOW ⬇ PLACE YOUR TEXT ADVERT BELOW ⬇⬇⬇