A license plate support mechanism is equipped with an attachment portion to which a license plate can be attached, a fixation portion fixating the attachment portion to a vehicle body, and a switching mechanism. The switching mechanism couples the attachment portion to the fixation portion such that the attachment portion is capable of displacing relative to the fixation portion. The switching mechanism also enables the attachment portion to switch between a storage position, in which the attachment portion is stored on a left/right direction inward side of a left/right pair of rear wheel fenders, and a display position, in which the attachment portion is positioned on the left/right direction outward side of the left/right pair of rear wheel fenders.