This man punched a 30-year-old woman in a random attack in a Midtown train station earlier this week, police said on Saturday.

The victim was walking on the southbound F train platform at the 34th Street-Herald Square station around 7:30 a.m. on Thursday when her attacker suddenly socked her on the side of the head, police said.

The woman refused medical attention for bruising and swelling to her face, cops said.

The suspect is about 5-foot-8, 140 pounds and was last seen wearing a black hoodie, black jeans and yellow boots, police said.