To enlarge a retractable flap and make it possible to appropriately retract the flap.SOLUTION: In an amphibious vehicle 1 in which a flap 13 for receiving lift from water during waterborne navigation is provided in an expandable and retractable manner on a front side of a travel direction of a vehicle body 11, the flap 13 has: a lower flap 21 which is retracted so as to approach a front face 11a of the vehicle body 11; and an upper flap 22 which is retracted so as to approach a top face 11b of the vehicle body 11, and at least one of the lower flap 21 and the upper flap 22 is constituted to have a first flap member 31 and a second flap member 32, and that a flap length Lin a direction orthogonal to a vehicle width direction is made variable.SELECTED DRAWING: Figure 1
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