A balanced differential amplifier sense amplifier senses the voltage level in a selected single bit line memory cell. The second semiconductor layer is formed on a first semiconductor layer and has a projecting shape. The second bracket is rotatably mounted to the first bracket via the pivot pin and has a valley portion recessed from one surface thereof. A flexible cable is disposed on one side or both sides of the print medium to connect the main board and the recording head. The above high-frequency switch can be miniaturized and has superior performance.