Police have arrested a 20-year-old Queensland man suspected of throwing an elderly man to the ground, kicking him and stealing his wallet.

The alleged offender followed the 75-year-old victim from the Commonwealth Bank to the ground level Myer car park at Westfield Belconnen at about 9.40am.

ACT Policing said the arrest follows a tip-off from a member of the public who recognised a facefit of the alleged offender.