A switching power supply comprising: an input terminal and an output terminal; a voltage converter including a first switching circuit configured to allow, when turned-on, for inputting a voltage from the input terminal, and a second switching circuit configured to allow, when turned-on, for outputting converted voltage from the output terminal; a control circuit configured to output a control signal to the first switching circuit and to a second delay circuit, and to output a control signal to the second switching circuit and a first delay circuit, wherein the control signals are for selectively sequentially switching on the first switching circuit by switching on a first switching element, and switching on the second switching circuit by switching on a second switching element; and the first delay circuit and the second delay circuit configured to delay, based on the control signal for switching on any one of the first switching circuit and the second switching circuit, a subsequent switching on timing of the other switching circuit to provide a dead time wherein both the first switching circuit and the second switching circuit are turned off, characterized in that each of the first delay circuit and the second delay circuit includes a first resistor (R5, R7) connected to a terminal configured for receiving one of the control signals, a second resistor (R6, R8) connected in series to the first resistor, a capacitance (C2, C3) connected in parallel to the second resistor, and a switching element (Q3, Q4) having a gate connected between the first resistor and the second resistor, and a drain, wherein the drain of the switching element in the first delay circuit is connected to the gate of the switching element in the first switching circuit, and the drain of the switching element in the second delay circuit is connected to the gate of the switching element in the second switching circuit. an input terminal and an output terminal; a voltage converter including a first switching circuit configured to allow, when turned-on, for inputting a voltage from the input terminal, and a second switching circuit configured to allow, when turned-on, for outputting converted voltage from the output terminal; a control circuit configured to output a control signal to the first switching circuit and to a second delay circuit, and to output a control signal to the second switching circuit and a first delay circuit, wherein the control signals are for selectively sequentially switching on the first switching circuit by switching on a first switching element, and switching on the second switching circuit by switching on a second switching element; and the first delay circuit and the second delay circuit configured to delay, based on the control signal for switching on any one of the first switching circuit and the second switching circuit, a subsequent switching on timing of the other switching circuit to provide a dead time wherein both the first switching circuit and the second switching circuit are turned off, characterized in that each of the first delay circuit and the second delay circuit includes a first resistor (R5, R7) connected to a terminal configured for receiving one of the control signals, a second resistor (R6, R8) connected in series to the first resistor, a capacitance (C2, C3) connected in parallel to the second resistor, and a switching element (Q3, Q4) having a gate connected between the first resistor and the second resistor, and a drain, wherein the drain of the switching element in the first delay circuit is connected to the gate of the switching element in the first switching circuit, and the drain of the switching element in the second delay circuit is connected to the gate of the switching element in the second switching circuit.