A power supply system for an electric vehicle comprising: a first power circuit coupled to a first electric storage device and an electrical load; a second power circuit coupled to a second electric storage device having higher output density and lower energy density than output density and energy density of the first electric storage device; a first remaining-amount parameter acquisition device (81, 74) that is configured to acquire a first remaining-amount parameter that increases or decreases in accordance with a remaining amount of the first electric storage device; a second remaining-amount parameter (82, 75) acquisition device that is configured to acquire a second remaining-amount parameter that increases or decreases in accordance with a remaining amount of the second electric storage device; a first maximum output acquisition device (81, 74) that is configured to acquire a first maximum output (P1_lim) corresponding to power that is able to be output from the first electric storage device; a second maximum output acquisition device (82, 75) that is configured to acquire a second maximum output (P2_lim) corresponding to power that is able to be output from the second electric storage device; a notification device (93, 71) that is configured to notify a remaining traveling possible distance; a voltage converter that is configured to convert a voltage between the first power circuit and the second power circuit; and a control device that is configured to operate the voltage converter to control a flow of power between the first power circuit and the second power circuit, the control device is configured to prohibit, when the first remaining-amount parameter is less than a remaining amount threshold and the first maximum output (P1_lim) is more than the output threshold, discharging of the second electric storage device, the control device is configured to permit, when the first remaining-amount parameter is more than the remaining amount threshold, discharging of the second electric storage device, and the control device is configured to use, when the first remaining-amount parameter is less than the remaining amount threshold, the first maximum output (P1_lim) is more than the output threshold, and the second remaining-amount parameter is less than a target remaining amount, power in the first power circuit to charge the second electric storage device., characterized in that: the notification device (93, 71) is configured to set the remaining traveling possible distance to 0 when a sum of the first maximum output (P1_lim) and the second maximum output (P2_lim) is less than an output threshold. a first power circuit coupled to a first electric storage device and an electrical load; a second power circuit coupled to a second electric storage device having higher output density and lower energy density than output density and energy density of the first electric storage device; a first remaining-amount parameter acquisition device (81, 74) that is configured to acquire a first remaining-amount parameter that increases or decreases in accordance with a remaining amount of the first electric storage device; a second remaining-amount parameter (82, 75) acquisition device that is configured to acquire a second remaining-amount parameter that increases or decreases in accordance with a remaining amount of the second electric storage device; a first maximum output acquisition device (81, 74) that is configured to acquire a first maximum output (P1_lim) corresponding to power that is able to be output from the first electric storage device; a second maximum output acquisition device (82, 75) that is configured to acquire a second maximum output (P2_lim) corresponding to power that is able to be output from the second electric storage device; a notification device (93, 71) that is configured to notify a remaining traveling possible distance; a voltage converter that is configured to convert a voltage between the first power circuit and the second power circuit; and a control device that is configured to operate the voltage converter to control a flow of power between the first power circuit and the second power circuit, the control device is configured to prohibit, when the first remaining-amount parameter is less than a remaining amount threshold and the first maximum output (P1_lim) is more than the output threshold, discharging of the second electric storage device, the control device is configured to permit, when the first remaining-amount parameter is more than the remaining amount threshold, discharging of the second electric storage device, and the control device is configured to use, when the first remaining-amount parameter is less than the remaining amount threshold, the first maximum output (P1_lim) is more than the output threshold, and the second remaining-amount parameter is less than a target remaining amount, power in the first power circuit to charge the second electric storage device., characterized in that: the notification device (93, 71) is configured to set the remaining traveling possible distance to 0 when a sum of the first maximum output (P1_lim) and the second maximum output (P2_lim) is less than an output threshold.