The light emission control device includes a PWM terminal to which a PWM signal is input, a first drive circuit for outputting a first control signal, a second drive circuit for outputting a second control signal, and a mode judgment circuit. The first control signal sets the first switching element to an ON state when the PWM signal is in an active state, and sets the first switching element to an OFF state when the PWM signal is in an inactive state. The second control signal controls an ON/OFF state of the second switching element when the PWM signal is in the active state. The mode judgment circuit judges between a PWM dimming mode and an analog dimming mode based on the PWM signal.