A bill handling apparatus according to one embodiment of the invention has a bill insertion slot into which a bill is inserted, a bill feeding mechanism for feeding the bill inserted from the bill insertion slot, a sensor for reading the fed bill, and a bill identifying section for identifying authentication of the bill read by the sensor, a sensor board on which the sensor is installed, and a control board for controlling each operation of the bill feeding mechanism, the sensor and the bill identifying section. The bill handling apparatus further has a first connector installed on the sensor board, and a second connector installed on the control board, and the first connector and the second connector are fitted with each other for electrical continuity.