A mobile device having a digital camera and an assembling method for a
ring is disclosed. The mobile device includes a housing, a digital camera
module and the ring, wherein the housing has a through hole which a notch
is formed therein. The digital camera module has an arm. The ring is
disposed in the through hole. Besides, one side of the ring includes an
extended part which is located on the notch and forms a dynamic
relationship with the arm.