Pillow device

A pillow device can be adhered to the pillow of a car seat is disclosed. The pillow device includes an adjustable or inflatable soft portion for supporting the neck of a passenger, a head supporting portion for preventing the head to turn aside. A ring sticky buckle serves to fix the pillow device on the pillow of a car seat so that other than the original function of a pillow, the pillow device of the present invention has a further function of protecting the head and neck of a passenger so as to improve the quality in sleep.