PROBLEM TO BE SOLVED: To provide a discharge lamp lighting device capable of ensuring the stability at starting up a discharge lamp without increasing the capacitance of a power supply capacitor of a switching element at the high side, and a luminaire using the same.SOLUTION: The discharge lamp lighting device includes: a first drive power supply (control power circuit 14) that outputs control voltage E1; a second drive power supply (auxiliary winding L3) that outputs a voltage which is proportional to a voltage output from a DC power circuit 10; a power supply capacitor C11 that supplies an operating voltage to a drive circuit of a switching element at the high side which maintains the ON state when at least starting a discharge lamp 3; and changeover means (first changeover circuit 15) that switches between a first path for charging a power supply capacitor C11 using the first drive power supply and a second path for charging the power supply capacitor C11 using the second drive power supply. The changeover
