The invention provides a reference voltage generation circuit and a DCDC converter having the same, and is capable of realizing shortening of starting time when a power supply is switched on and reduction of power consumption. The reference voltage generation circuit includes a bandgap reference circuit, a first resistive element and a second resistive element connected in series between the output node and a ground terminal, a third resistive element, a fourth resistive element, and a first switch connected in series between the output node and the ground terminal, and a second switch having one end connected to a connecting point of the first resistive element and the second resistive element, at which a reference voltage is generated, and the other end connected to a connecting point of the third resistive element and the fourth resistive element. A ratio between resistance values of the first resistive element and the second resistive element is equal to a ratio between resistance values of the third resistive element and the fourth resistive element. The first and second switches are turned on at a power-on state and turned off after the reference voltage is started.