A storage device adapted for portable device and suitable to be installed in luggage includes an inner housing, an outer housing and a base. The inner housing includes two parallel vertical side walls and a transverse base wall connected to bottoms of the vertical side walls. The vertical side walls are provided with a baffle plate and/or a baffle bar at both front and rear sides. The outer housing has a top opening and defines a receiving cavity to receive the inner housing. The base is arranged below the transverse base wall and includes two connecting brackets and a connecting pin. The transverse base wall has two connecting legs extending away from its bottom. The connecting legs each define a vertical waist-shaped hole and sleeve over the connecting pin through the vertical waist-shaped holes. Two sides of the base are connected to the receiving cavity in a slidable manner.