Nassau detectives said they are searching for a gunman who pistol-whipped a man in an Inwood convenience store in a brazen daytime robbery attempt Thursday morning.

The 10:20 a.m. attack on Convenience Grocery at 15 Bayview Ave. left the 54-year-old victim with a fractured skull and lacerations, Fourth Squad detectives said.

The injuries occurred as the gunman walked in and began struggling with the victim — during which time the gun discharged, police said. The victim was not hit, police said.

The suspect, who was described as being in his mid-30s; 6 feet, 2 inches tall; having a slim build; and wearing a black skullcap, blue sweater and black jacket, fled west on Bayview Avenue, but took no money or merchandise from the store.

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One employee was also in the store at the time who was not hurt, police said.

Detectives ask anyone with information to contact Nassau County Crime Stoppers at 800-244-TIPS.