Police are appealing for information following a robbery at about 5.10pm yesterday.
A West Yorkshire Police spokesperson said: "A woman in her forties was just getting into her black Nissan Juke in Gain Lane (D16 TMB) when the suspect opened the passenger door and made demands for the keys.
"The woman was struck on the hand with a hammer before the suspect climbed into the driver’s seat and drove away.
"The woman received minor injuries which did not require hospital treatment.
"The suspect is believed to be an Asian male of slim build, who is thought to be around 5ft 10ins tall and in his late teens or early twenties.
"He was wearing dark clothing with a black ‘puffa’ style jacket and had a thin black scarf covering part of his face."
Enquiries by Bradford District CID are at an early stage, but the offence is not thought to be linked to a similar robbery in Wilsden last week in which a 30-year-old man from Bradford was arrested and later released under investigation.
Anyone with information is asked to contact Bradford District CID on 101, quoting crime reference 13170546973.
Information can also be reported anonymously to the independent charity Crimestoppers on 0800 555111.