A mined material transport vehicle includes: a vehicle main body (10) capable of moving forward and rearward; and a loading platform (20) provided on the vehicle main body, wherein the loading platform (20) includes: a conveyor provided on the vehicle main body and having a conveying surface capable of conveying a mined material in a conveying direction (C) extending in a forward-rearward directions; a pair of movable flaps (50) that extend in the conveying direction (C) on both sides in a vehicle width direction of the conveying surface, form a storage space together with the conveying surface, and are rotatable about lateral axial lines extending in the conveying direction (C); and lateral cylinders (70) for rotating the movable flaps (50) about the lateral axial lines.
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