A saddle riding vehicle including an engine, a vehicle body frame, a vehicle body cover, an intake resonator, a front fork and an intake system structure, the intake system structure comprising: an air cleaner arranged at an upper part of the engine; and an intake duct that comprises an upstream section (37e-2) and a downstream section (37e-1) connected to the air cleaner and that is configured to introduce external air from a front side of a vehicle body of the saddle riding vehicle into the air cleaner, wherein an upstream section (37e-2) of the intake duct is attached to the vehicle body cover configured to cover an outside of a front region of the vehicle body frame, wherein an upward curved section curved upward in a protruding shape is formed at the intake duct between the upstream section (37e-2) and the downstream section (37e-1), wherein an upward inclined region (51a-1) is formed on a front side of the upward curved section and a downward inclined region (51a-2) is formed at a rear side of the upward curved section, and wherein the intake resonator connected to the upward curved section is disposed below the upward curved section of the intake duct and is configured to reduce intake noise upon suction of the external air, the intake duct has a connecting section with respect to the intake resonator at a lower wall corresponding to an apex part of the upward curved section in a curved direction, and characterized in that, the intake resonator is supported by and fixed at front and rear positions bridging over a curved shape of the upward curved section so as to extend over the upward inclined region (51a-1) at the front side and the downward inclined region (51a-2) at the rear side of the upward curved section. an air cleaner arranged at an upper part of the engine; and an intake duct that comprises an upstream section (37e-2) and a downstream section (37e-1) connected to the air cleaner and that is configured to introduce external air from a front side of a vehicle body of the saddle riding vehicle into the air cleaner, wherein an upstream section (37e-2) of the intake duct is attached to the vehicle body cover configured to cover an outside of a front region of the vehicle body frame, wherein an upward curved section curved upward in a protruding shape is formed at the intake duct between the upstream section (37e-2) and the downstream section (37e-1), wherein an upward inclined region (51a-1) is formed on a front side of the upward curved section and a downward inclined region (51a-2) is formed at a rear side of the upward curved section, and wherein the intake resonator connected to the upward curved section is disposed below the upward curved section of the intake duct and is configured to reduce intake noise upon suction of the external air, the intake duct has a connecting section with respect to the intake resonator at a lower wall corresponding to an apex part of the upward curved section in a curved direction, and characterized in that, the intake resonator is supported by and fixed at front and rear positions bridging over a curved shape of the upward curved section so as to extend over the upward inclined region (51a-1) at the front side and the downward inclined region (51a-2) at the rear side of the upward curved section.