A man riding between two subway cars died Tuesday morning when he slipped and fell under the moving train, police said.

The 63-year-old was standing between two cars of a Manhattan-bound E train around 5:15 a.m. as it rolled into the Rego Park station at Queens Boulevard and 63rd Drive.

Suddenly, the man lost his balance, and tumbled under the train, police said.

The victim, who has not yet been identified, was pronounced dead at the scene.