To provide a safety control device of an inverter, the configuration of which is simplified without reducing the reliability on the torque off of a motor. A first torque off processing circuit 311, in response to a first torque off command TOF1, forcibly turns off two phase upper-arm switching elements 11 and 12, of three phase upper-arm switching elements 11, 12, and 13, regardless of the condition of generation of control signals from a control device 2. A second torque off processing circuit 312, in response to a second torque off command TOF2, forcibly turns off two phase lower-arm switching elements 14 and 15 connected to the two phase upper-arm switching elements 11 and 12, regardless of the condition of generation of the control signals from the control device 2. As two phases' worth of wires suffice for forcibly turning off the upper-arm switching elements and lower-arm switching elements, it is possible to simplify wiring.