A work machine comprising: a machine body that can travel with left and right front wheels and left and right rear wheels; and an implement (C,14) supported to the machine body; wherein an engine driving the front wheels, the rear wheels and the implement (C, 14) and a fuel tank reserving fuel for the engine are disposed between the front wheels and the rear wheels in a front/rear direction of the machine body and at positions offset to further outer side than the left/right center of the machine body; characterized in that: the fuel tank is disposed under the engine and overlaps with the engine as seen in a plan view, a main frame is provided below the fuel tank and supports the engine and the fuel tank, and a protection member is provided to and supported by the main frame; the fuel tank is provided with an oil feeding pipe which extends upwards from an outer end position of the fuel tank in an offset direction in which the fuel tank is offset as seen in the plan view; and a cap detachably attached to an upper end of the oil feeding pipe; the protection member protrudes to a further outer side in the offset direction than an outer end position of the fuel tank as seen in the plan view, and is disposed below the oil feeding pipe and protrudes to a further outer side in the offset direction than an outer circumference of the cap as seen in the plan view. a machine body that can travel with left and right front wheels and left and right rear wheels; and an implement (C,14) supported to the machine body; wherein an engine driving the front wheels, the rear wheels and the implement (C, 14) and a fuel tank reserving fuel for the engine are disposed between the front wheels and the rear wheels in a front/rear direction of the machine body and at positions offset to further outer side than the left/right center of the machine body; characterized in that: the fuel tank is disposed under the engine and overlaps with the engine as seen in a plan view, a main frame is provided below the fuel tank and supports the engine and the fuel tank, and a protection member is provided to and supported by the main frame; the fuel tank is provided with an oil feeding pipe which extends upwards from an outer end position of the fuel tank in an offset direction in which the fuel tank is offset as seen in the plan view; and a cap detachably attached to an upper end of the oil feeding pipe; the protection member protrudes to a further outer side in the offset direction than an outer end position of the fuel tank as seen in the plan view, and is disposed below the oil feeding pipe and protrudes to a further outer side in the offset direction than an outer circumference of the cap as seen in the plan view. the fuel tank is disposed under the engine and overlaps with the engine as seen in a plan view, a main frame is provided below the fuel tank and supports the engine and the fuel tank, and a protection member is provided to and supported by the main frame; the fuel tank is provided with an oil feeding pipe which extends upwards from an outer end position of the fuel tank in an offset direction in which the fuel tank is offset as seen in the plan view; and a cap detachably attached to an upper end of the oil feeding pipe; the protection member protrudes to a further outer side in the offset direction than an outer end position of the fuel tank as seen in the plan view, and is disposed below the oil feeding pipe and protrudes to a further outer side in the offset direction than an outer circumference of the cap as seen in the plan view.