A multi-axis robot power shut-off device (1a, 1b) comprising: a plurality of motors (M1,..., M6) configured to drive a plurality of axes (A1,..., A6) of a multi-axis robot, respectively; a plurality of power converters configured to control operation of the plurality of motors (M1,..., M6), respectively, by supplying and controlling electric power to the plurality of motors (M1,..., M6); drive circuits, each of which is configured to drive first semiconductor switching elements included in a corresponding one of the power converters by outputting drive signals to control terminals of the first semiconductor switching elements in accordance with control signals for controlling the operation of the motors (M1,..., M6); a first shut-off circuit provided at a non-end position in a first electrical path, through which first operating power is supplied to the drive circuits; a plurality of solenoid brakes configured to that apply a brake to the plurality of axes (A1,..., A6), respectively; a second shut-off circuit provided at a non-end position in a second electrical path, through which second operating power is supplied to the solenoid brakes; and a shut-off control circuit (15a, 15b) configured to output shut-off signals to the first and second shut-off circuits (14a, 14b), wherein at least one of the first and second shut-off circuits (14a, 14b), hereinafter a specific shut-off circuit, includes at least two second semiconductor switching elements that are inserted in series to each other in one of the first and second electrical paths, hereinafter a specific electrical path, that corresponds to the specific shut-off circuit (14a, 14b), the second semiconductor switching elements turning off in accordance with the shut-off signals, respectively, to shut off the specific electrical path. a plurality of motors (M1,..., M6) configured to drive a plurality of axes (A1,..., A6) of a multi-axis robot, respectively; a plurality of power converters configured to control operation of the plurality of motors (M1,..., M6), respectively, by supplying and controlling electric power to the plurality of motors (M1,..., M6); drive circuits, each of which is configured to drive first semiconductor switching elements included in a corresponding one of the power converters by outputting drive signals to control terminals of the first semiconductor switching elements in accordance with control signals for controlling the operation of the motors (M1,..., M6); a first shut-off circuit provided at a non-end position in a first electrical path, through which first operating power is supplied to the drive circuits; a plurality of solenoid brakes configured to that apply a brake to the plurality of axes (A1,..., A6), respectively; a second shut-off circuit provided at a non-end position in a second electrical path, through which second operating power is supplied to the solenoid brakes; and a shut-off control circuit (15a, 15b) configured to output shut-off signals to the first and second shut-off circuits (14a, 14b), wherein at least one of the first and second shut-off circuits (14a, 14b), hereinafter a specific shut-off circuit, includes at least two second semiconductor switching elements that are inserted in series to each other in one of the first and second electrical paths, hereinafter a specific electrical path, that corresponds to the specific shut-off circuit (14a, 14b), the second semiconductor switching elements turning off in accordance with the shut-off signals, respectively, to shut off the specific electrical path.