A woman was robbed at knifepoint on a Bronx subway platform in the middle of the afternoon, police said Wednesday.

The 30-year-old victim was standing on the platform of the “B/D” subway station at 174-175 Street in Tremont around 4 p.m. on Jan. 3 when a man came up to her, pressed a knife against her stomach and demanded she give him her belongings, police said.

She opened her purse and he snatched three of her bank cards and a measly $6, police said.