A merciless mugger brutally beat a 54-year-old woman after cornering her in a vestibule in order to snatch her purse, cops said.

The attack, which was caught on surveillance footage in the victim’s Upper East Side apartment, shows the crook throwing a powerful punch at the woman’s face during the robbery–knocking her to the ground Friday.

The thief tailed the unnamed woman into the entrance of her building on E. 67th Street just after 11p.m., and barked that she hand over her handbag, police said.

When she declines, the video shows the mugger, his face contorted in rage backing her into the corner before he pummels her.

The suspect eventually rips the bag from her clutches and fled the building, according to authorities.

She was transported to New York Presbyterian Hospital where she was treated for a gash near her left eye, and facial bruising.

The man is described as 5-foot-4, and between 40 and 45 years old. He was last seen wearing a white t-shirt and a black coat, pants, and hat.

Anyone with information is asked to call the NYPD’s Crime Stoppers Hotline at 800-577-TIPS. All calls are confidential.