A light emitting element driving circuit, which can achieve accurate/high-speed operation even at low voltage supply voltage, comprises: driving current supply, connected to light emitting element in series between first and second power supplies, to supply driving current to the light emitting element according to the voltage of control terminal; current determiner to determine and output the current according to an output light amount of the light emitting element; current/voltage converter to convert the determined current into voltage and output it to the control terminal of the driving current supply if control signal is in a first state, and to electrically shield its output voltage terminal from the control terminal of the driving current supply if the control signal is in a second state; and resetter to connect the control terminal of the driving current supply to the second power supply if the control signal is in the second state.