Provided is an adhesion device used to cradle a car navigation system, a mobile phone, etc. The adhesion device according to the present invention comprises a pad (21) having a bottom surface attached to an adhesion surface, a center element (23) fixed upright at the center of the top surface of the pad (21), a housing (22) placed on the top surface of the pad (21) and having a hole through which the center element (23) passes, a ring-shaped leaf spring (27) which is equipped at the outer circumference of the housing (22) and presses the outer circumference of the top surface of the pad (21) and an adhesion controller (24) connected with the top end of the center element (23) by an axis (24c). The adhesion controller (24) comprises a lever (24a) and a press (24b). When the lever (24a) is rotated around the axis (24c), the press (24b) presses down the top surface of the housing (22) and the center of the pad (21) connected with the center element (23) is moved upward, resulting in an expansion of the space between the pad (21) and the adhesion surface and a pressure lower than the atmospheric pressure.