Reservoir tank mounting structure of saddle riding vehicle

A reservoir tank mounting structure of a saddle riding vehicle comprising:

• a reservoir tank configured to store a hydraulic fluid of a brake apparatus;
• and
• an auxiliary machine case configured to accommodate an auxiliary machine mounted on the vehicle,
• wherein the auxiliary machine case has a tank supporting section at which the reservoir tank is supported,
• the tank supporting section is formed at a recessed section that is formed by having an outer surface of the auxiliary machine case recessed inward, and
• the tank supporting section includes an outer surface covering wall that is configured to cover an outer surface of the reservoir tank with a shape substantially conforming to an outer surface shape of the reservoir tank.