A power supply switching control system configured to switch a power supply for supplying power to a plurality of loads (L, L1-L4) between a first power supply and a second power supply in a power supply system that includes the first power supply and the second power supply connected in parallel to the plurality of loads (L, L1-L4) and wherein the first power supply, the second power supply, and the plurality of loads (L, L1-L4) are connected through a power supply path in an order of the first power supply, the load (L, L1-L4), and the second power supply, the power supply switching control system comprising: a first switch that is a MOSFET provided between a connection point of the first power supply and a connection point of the plurality of loads (L, L1-L4) in the power supply path and configured to cut off a current flowing from a side of the second power supply to a side of the first power supply in an off state of the first switch; a second switch that is a MOSFET provided between a connection point of the second power supply and the connection point of the plurality of loads (L, L1-L4) in the power supply path and configured to cut off a current flowing from a side of the first power supply to a side of the second power supply in an off state of the second switch; and a control unit (20,220) configured to set the second switch in an on state when the second power supply is charged; characterized by a plurality of third switches (211, 212, 213) configured to be connected in series to the power supply path and arranged between the first switch and the second switch, wherein each of the third switches (211, 212, 213) is configured to cut off a bidirectional current flowing therethrough in an off state thereof; and wherein each of the plurality of loads (L, L1-L4) is configured to be connected according to one of: between the first switch and one of the third switches (211, 212, 213), between the second switch and another of the third switches (211, 212, 213), and between the third switches (211, 212, 213) in the power supply path. a first switch that is a MOSFET provided between a connection point of the first power supply and a connection point of the plurality of loads (L, L1-L4) in the power supply path and configured to cut off a current flowing from a side of the second power supply to a side of the first power supply in an off state of the first switch; a second switch that is a MOSFET provided between a connection point of the second power supply and the connection point of the plurality of loads (L, L1-L4) in the power supply path and configured to cut off a current flowing from a side of the first power supply to a side of the second power supply in an off state of the second switch; and a control unit (20,220) configured to set the second switch in an on state when the second power supply is charged; characterized by a plurality of third switches (211, 212, 213) configured to be connected in series to the power supply path and arranged between the first switch and the second switch, wherein each of the third switches (211, 212, 213) is configured to cut off a bidirectional current flowing therethrough in an off state thereof; and wherein each of the plurality of loads (L, L1-L4) is configured to be connected according to one of: between the first switch and one of the third switches (211, 212, 213), between the second switch and another of the third switches (211, 212, 213), and between the third switches (211, 212, 213) in the power supply path.