The 25-year-old's Bentley is reported to have been snapped by a passer-by at the Trafford Centre in Greater Manchester.
"He seems to think he's above the law," the onlooker told The Sun. "Hart is young and very fit, why on earth wouldn't he just use a normal space and walk an extra few metres?
"I'm surprised his girlfriend didn't say anything to him. Surely anyone with a bit of compassion wouldn't take a space clearly reserved for people less able than you."
Hart was left out of the City side that clinched a place in the FA Cup final courtesy of a 2-1 win over Chelsea at Wembley yesterday.