A self-driving work vehicle, comprising: a traveling apparatus (1, 2); a vehicle body supported by the traveling apparatus on ground; a variable traveling power supply apparatus configured to supply rotational drive power to the traveling apparatus; a travel operation interface configured to adjust a rate of the rotational drive power; a parking brake provided for a transmission shaft (22, 23) of the variable traveling power supply apparatus; a rotation detector configured to detect rotation of the traveling apparatus or the transmission shaft (22, 23); and a controller configured or programmed to: control the parking brake to a braking state or a non-braking state by a parking brake control module; manage the braking state or the non-braking state as a vehicle body state by a condition management module, the braking state and the non-braking state being operating states of the parking brake; based on the vehicle body state and a result of the detection by the rotation detector, determine that the parking brake is in an abnormal state, by a brake abnormality determination module, in response to the rotation detector detecting the rotation while the parking brake is in the braking state; characterised in that in response to the brake abnormality determination module determining that the parking brake is in the abnormal state while the rotational drive power to the traveling apparatus (1, 2) is in a cut-off state, forcibly switch the rotational drive power from the cut-off state into a transmitted state. a traveling apparatus (1, 2); a vehicle body supported by the traveling apparatus on ground; a variable traveling power supply apparatus configured to supply rotational drive power to the traveling apparatus; a travel operation interface configured to adjust a rate of the rotational drive power; a parking brake provided for a transmission shaft (22, 23) of the variable traveling power supply apparatus; a rotation detector configured to detect rotation of the traveling apparatus or the transmission shaft (22, 23); and a controller configured or programmed to: control the parking brake to a braking state or a non-braking state by a parking brake control module; manage the braking state or the non-braking state as a vehicle body state by a condition management module, the braking state and the non-braking state being operating states of the parking brake; based on the vehicle body state and a result of the detection by the rotation detector, determine that the parking brake is in an abnormal state, by a brake abnormality determination module, in response to the rotation detector detecting the rotation while the parking brake is in the braking state; characterised in that in response to the brake abnormality determination module determining that the parking brake is in the abnormal state while the rotational drive power to the traveling apparatus (1, 2) is in a cut-off state, forcibly switch the rotational drive power from the cut-off state into a transmitted state. control the parking brake to a braking state or a non-braking state by a parking brake control module; manage the braking state or the non-braking state as a vehicle body state by a condition management module, the braking state and the non-braking state being operating states of the parking brake; based on the vehicle body state and a result of the detection by the rotation detector, determine that the parking brake is in an abnormal state, by a brake abnormality determination module, in response to the rotation detector detecting the rotation while the parking brake is in the braking state; characterised in that in response to the brake abnormality determination module determining that the parking brake is in the abnormal state while the rotational drive power to the traveling apparatus (1, 2) is in a cut-off state, forcibly switch the rotational drive power from the cut-off state into a transmitted state.