An electronic device includes a housing and an installation assembly. The housing defines an opening. The installation assembly includes a fixing member and a holding member. The fixing member includes a base and a fixing portion protruding from the base. The base defines an entrance corresponding to the opening. The holding member comprising a holding portion and an engaging portion formed on an end of the holding portion. The fixing portion runs through the opening, and the base abuts against an outer surface of the housing with the entrance corresponding to the first opening. The engaging portion is engaged with the fixing portion to fix the holding member to the fixing member in the housing, and the engaging portion abuts against an inner surface of the housing, such that the installation assembly is fixed the housing surrounding the first opening.