A storage device accommodating structure for positioning a storage device includes a chassis, a press plate, a pair of supporting stands and an elastic member. The press plate is moveably arranged inside the chassis, the pair of supporting stands are moveably and alternatively arranged at one lateral side of the press plate, one side of each one of the supporting stands is connected to the press plate and another side thereof abuts against the chassis, the elastic member is elastically arranged among the press plate, each one of the supporting stands and the chassis; therefore, the press plate is able to adjust a position thereof and to press onto the storage device via an elastic recovery force of the elastic member. Accordingly, the storage device can be firmly inserted inside the chassis and maintain an excellent electrical connection with the connector.