A semiconductor output circuit, comprising: a first power supply line; an output terminal to be coupled to a second power supply line through a load; an output transistor coupled between the first power supply line and the output terminal, and driven in response to a control signal; a depletion transistor coupled between a control terminal of the output transistor and the output terminal; an intermediate voltage generating circuit generating an intermediate potential between a potential of the first power supply line and a potential of the second power supply line to an intermediate voltage line; a series circuit of a first switch transistor and an impedance device, which are coupled between the intermediate voltage line and the output terminal; and an inverter which is operated at a voltage between the potential of the first power supply line and the intermediate potential of the intermediate voltage line, and inverts the control signal to supply an inverted control signal to the gate of the first switch transistor, wherein a voltage based on the intermediate potential is applied to a gate of the depletion transistor through the first switch transistor to turn off the depletion transistor when the output transistor is in a conductive state; and the gate and a source of the depletion transistor are electrically connected to each other through the impedance device to turn on the depletion transistor when the output transistor is brought in a nonconductive state and the first switching transistor is in a nonconductive state, characterized by comprising a series circuit of a second switch transistor and a constant voltage device, which are provided between the first power supply line and the output terminal, wherein an output of the inverter is supplied to a gate of the second switch transistor; and a node between the second switch transistor and the constant voltage device is coupled to the source of the depletion transistor. a first power supply line; an output terminal to be coupled to a second power supply line through a load; an output transistor coupled between the first power supply line and the output terminal, and driven in response to a control signal; a depletion transistor coupled between a control terminal of the output transistor and the output terminal; an intermediate voltage generating circuit generating an intermediate potential between a potential of the first power supply line and a potential of the second power supply line to an intermediate voltage line; a series circuit of a first switch transistor and an impedance device, which are coupled between the intermediate voltage line and the output terminal; and an inverter which is operated at a voltage between the potential of the first power supply line and the intermediate potential of the intermediate voltage line, and inverts the control signal to supply an inverted control signal to the gate of the first switch transistor, wherein a voltage based on the intermediate potential is applied to a gate of the depletion transistor through the first switch transistor to turn off the depletion transistor when the output transistor is in a conductive state; and the gate and a source of the depletion transistor are electrically connected to each other through the impedance device to turn on the depletion transistor when the output transistor is brought in a nonconductive state and the first switching transistor is in a nonconductive state, characterized by comprising a series circuit of a second switch transistor and a constant voltage device, which are provided between the first power supply line and the output terminal, wherein an output of the inverter is supplied to a gate of the second switch transistor; and a node between the second switch transistor and the constant voltage device is coupled to the source of the depletion transistor.