A shifting-operation detection unit comprising: a first detection unit provided on a link unit of a shift mechanism, which couples a transmission and a shift pedal both being mounted on a saddle-ride type vehicle to each other, to detect a shift-up operation of the transmission in accordance with an operation of the shift pedal and include a first switch, and a second detection unit provided on the link unit to detect a shift-down operation of the transmission in accordance with an operation of the shift pedal and include a second switch, and characterised by: the first detection unit being provided with a first resistor connected in series to the first switch and a second resistor connected in parallel to the first switch and the first resistor, the second detection unit being provided with a third resistor connected in series to the second switch and a fourth resistor connected in parallel to the second switch and the third resistor, wherein the first detection unit and the second detection unit are connected in series to be connected to correspond to a power supply terminal and a ground terminal of an external device and apply a divided voltage of a voltage of the power supply terminal to the external device via an electric wire, the divided voltage having voltage values corresponding to the shift-up operation and the shift-down operation, respectively. a first detection unit provided on a link unit of a shift mechanism, which couples a transmission and a shift pedal both being mounted on a saddle-ride type vehicle to each other, to detect a shift-up operation of the transmission in accordance with an operation of the shift pedal and include a first switch, and a second detection unit provided on the link unit to detect a shift-down operation of the transmission in accordance with an operation of the shift pedal and include a second switch, and characterised by: the first detection unit being provided with a first resistor connected in series to the first switch and a second resistor connected in parallel to the first switch and the first resistor, the second detection unit being provided with a third resistor connected in series to the second switch and a fourth resistor connected in parallel to the second switch and the third resistor, wherein the first detection unit and the second detection unit are connected in series to be connected to correspond to a power supply terminal and a ground terminal of an external device and apply a divided voltage of a voltage of the power supply terminal to the external device via an electric wire, the divided voltage having voltage values corresponding to the shift-up operation and the shift-down operation, respectively. the first detection unit being provided with a first resistor connected in series to the first switch and a second resistor connected in parallel to the first switch and the first resistor, the second detection unit being provided with a third resistor connected in series to the second switch and a fourth resistor connected in parallel to the second switch and the third resistor, wherein the first detection unit and the second detection unit are connected in series to be connected to correspond to a power supply terminal and a ground terminal of an external device and apply a divided voltage of a voltage of the power supply terminal to the external device via an electric wire, the divided voltage having voltage values corresponding to the shift-up operation and the shift-down operation, respectively.