An electrical component mounting structure for a motorcycle includes a vehicle body frame. The vehicle body frame includes: main frames extending downwardly toward rear from a head pipe, the main frames for suspending a power unit; and pivot frames extending downward from rear ends of the main frames to be disposed at left and right in a vehicle width direction. An electrical component including a first ECU is supported in this electrical component mounting structure. In this electrical component mounting structure, the power unit includes a crankcase and a cylinder portion that protrudes from the crankcase, and the first ECU is disposed, in a side view, anterior to the left and right pivot frames, posterior to the cylinder portion, and above the crankcase.