A fuel tank covering (26) to cover an upper portion of a fuel tank (25) supported by a motorcycle frame structure (FR) covers an intermediate portion of the fuel tank (25) ranging from a front end portion to a rear end portion with respect to a direction widthwise of the motorcycle, and includes a shielding portion (36) configured to cover a mounting area at a front portion where a key cylinder (35) disposed forwardly of the fuel tank (25) is mounted on the motorcycle frame structure (FR).