LIGHT-EMITTING ELEMENT DRIVING DEVICE, LIGHTING DEVICE, AND VEHICLE

A light-emitting element driving device () includes: a first external terminal (SET terminal) connectable to a first setting resistor (Rset); a second external terminal (SET_TH terminal) connectable to a first thermistor (TH) with a negative coefficient arranged beside a light-emitting element light source (); a current setter () that generates a setting current (Iset) based on the resistance value of the first setting resistor; a current adder () that generates an addition current (Iadd) with a negative coefficient to the resistance value of the first thermistor; and a current driver () that generates an output current (Iout) that passes through the light-emitting element light source connected between an application terminal for a supply voltage (Vin) and a ground terminal based on a reference current (Iref) which is the sum of the setting current and the addition current.