To attach a pressure sensor to a motorcycle while suppressing the increase of the number of components and layout space when the pressure sensor of brake fluid cannot be attached to a port for a sensor of a hydraulic control unit for a brake system.

In the pressure sensor supporting structure of the motorcycle for supporting an external pressure sensor 90 detecting brake fluid pressure to the motorcycle equipped with an anti-lock brake system and a front and rear interlocking brake system, a joint 94 for a sensor connecting the external pressure sensor 90 to a port 1f for brake piping connection of the hydraulic control unit 1 for the brake system and a joint 95 for a piping connecting a brake piping for the brake system are jointly fastened with a banjo bolt 96.

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