A lamp body control apparatus for controlling, in accordance with an operation of a display switch that is provided on a vehicle, blinking of a lamp body that is provided on the vehicle, the lamp body control apparatus comprising: a drive output terminal that is electrically connected to the display switch and that supplies a current, as a blinking signal, to the lamp body via the display switch to cause the lamp body to blink; an input part that has an input terminal which is connected via a level adjustment part to the drive output terminal, said input part is configured to output a status signal representative of a state of the display switch, said status signal having a first logic level when the input terminal of the input part is at a first voltage level, said first logic level being representative of an ON state of the display switch, and said status signal having a second logic level when the input terminal of the input part is at a second voltage level, said second logic level being representative of an OFF state of the display switch; a control part that outputs a blinking command signal when the status signal that is output from the input part has the first logic level; an output part that generates the blinking signal and outputs the blinking signal to the lamp body via the drive output terminal when the blinking command signal is output from the control part; the level adjustment part that is connected to the drive output terminal, that outputs a signal of the second level to the input terminal of the input part when the display switch is in the OFF state, and that outputs a signal of the first level to the input terminal of the input part when the display switch is operated to an ON state; and a self-maintaining part that supplies a signal, based on a logic level of the blinking command signal, from the output part to the input terminal to maintain a logic level of the status signal that is generated by the input part when the output part supplies the current that causes the lamp body to blink to the drive output terminal, characterized in that the output part has a bipolar transistor and a field-effect transistor, the bipolar transistor having a base terminal connected to the control part and having a collector terminal connected to a gate terminal of the field-effect transistor, the field-effect transistor having a drain terminal electrically connected to the drive output terminal and having a source terminal connected to an electric source (Vcc); and the level adjustment part has a Zener diode, the Zener diode having an anode terminal electrically connected to the drive output terminal and having a cathode terminal connected to the input terminal of the input part. a drive output terminal that is electrically connected to the display switch and that supplies a current, as a blinking signal, to the lamp body via the display switch to cause the lamp body to blink; an input part that has an input terminal which is connected via a level adjustment part to the drive output terminal, said input part is configured to output a status signal representative of a state of the display switch, said status signal having a first logic level when the input terminal of the input part is at a first voltage level, said first logic level being representative of an ON state of the display switch, and said status signal having a second logic level when the input terminal of the input part is at a second voltage level, said second logic level being representative of an OFF state of the display switch; a control part that outputs a blinking command signal when the status signal that is output from the input part has the first logic level; an output part that generates the blinking signal and outputs the blinking signal to the lamp body via the drive output terminal when the blinking command signal is output from the control part; the level adjustment part that is connected to the drive output terminal, that outputs a signal of the second level to the input terminal of the input part when the display switch is in the OFF state, and that outputs a signal of the first level to the input terminal of the input part when the display switch is operated to an ON state; and a self-maintaining part that supplies a signal, based on a logic level of the blinking command signal, from the output part to the input terminal to maintain a logic level of the status signal that is generated by the input part when the output part supplies the current that causes the lamp body to blink to the drive output terminal, characterized in that the output part has a bipolar transistor and a field-effect transistor, the bipolar transistor having a base terminal connected to the control part and having a collector terminal connected to a gate terminal of the field-effect transistor, the field-effect transistor having a drain terminal electrically connected to the drive output terminal and having a source terminal connected to an electric source (Vcc); and the level adjustment part has a Zener diode, the Zener diode having an anode terminal electrically connected to the drive output terminal and having a cathode terminal connected to the input terminal of the input part.