External device support structure of saddle riding vehicle

An external device support structure of a saddle riding vehicle, the saddle riding vehicle including an external device holder in which an external device is installable, a connector for connecting the external device via a cable, and a protection cap which is attachable to and detachable from the connector, wherein:

• the external device holder is provided in front of a rider and above or in front of an instrument section visible by the rider when sitting on a seat of the saddle riding vehicle so that the external device holder and the instrument section are visually recognizable by the rider when sitting on the seat,
• the connector is provided on one side of the instrument section in a left-right direction of a vehicle body of the saddle riding vehicle,
• the cable extends in at least one of an up-down direction and a front-rear direction along the one side of the instrument section and connects to the connector and the external device,
• a cable supporter that supports the cable is provided on the one side of the instrument section to be exposed on an outside of the vehicle body,
• the cable supporter is provided at a position closer to the connector than the external device installed in the external device holder,
• the cable supporter is located within a range of an outer shape size of the protection cap from an outer edge of the connector, and
• the cable supporter supports the protection cap when the protection cap is detached from the connector.