Those killed in the resulting rush to the doors included three girls, two boys and an adult woman - a mother who had accompanied her daughter to the Lanterna Azzurra nightclub in Corinaldo, police chief Oreste Capocasa said.
Five children are among six people who have died in a stampede at an Italian nightclub, police have said.
About 1,000 people were in the Blue Lantern club in the town of Corinaldo on the Adriatic coast for a performance by Italian rapper Sfera Ebbasta, according to local reports.
Fourteen of the injured were in serious condition, and 40 others less seriously injured, Mr Poggiali said.
The ages of the victims have not yet been given. The provincial capital of Ancona is the nearest big town.
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Some reports say there was panic after pepper spray was sacked inside the club in the town of Corinaldo. Numerous injured suffered crushing wounds.
The accident happened around 1:00am (00:00 GMT).
Some survivors were quoted by Italian media as saying at least one fire exit was blocked when concertgoers tried to get out.
A 16-year-old boy told Ansa that fans were dancing while waiting for the start of the show when the stampede erupted. "The bouncers were getting the persons out", one unidentified witness told RAI state radio.
"The cause may have been the dispersal of a stinging substance, the young people fled and trampled over each other".