A museum dedicated to the creator of the popular "Doraemon" cartoon series opened Saturday in Kawasaki, marking the fictional birthday of the catlike robot.

The three-story Fujiko F. Fujio Museum has around 50,000 of the cartoonist's original drawings in storage, and about 130 of them on display, along with a desk and other items Fujiko used up until his death in 1996, the museum's operator said.

Many of the 500 people who had lined up to be the first inside the museum were allowed in at 10 a.m. The 2,000 first-day tickets sold out within two hours of going on sale.

To avoid overcrowding, the museum limits attendance to 2,000 people a day, spread over four time slots, and reservations must be made in advance.