A storage device electrically connected to a host circuit includes a data receiving unit, determination unit, and a data transmitting unit. The weak seal portion is formed by joining the one side of the first medical solution storage chamber forming portion and the one side of the second medical solution storage chamber forming portion. The second flat cable further has signal transmission lines arranged on it. An optimized artificial impedance pattern is then calculated by iteratively re-calculating the artificial impedance pattern from the actual surface wave profile and the desired far field radiation pattern. In the endoscope, the control section of the hand-held unit includes a bending knob, a second bending lever, a first locking lever, and a second locking lever.