To provide a switch for a DC power supply capable of achieving a long life by suppressing generation of arc between contacts when switching on and off the switch for load control.

The switch for the DC power supply includes a first switching element SW1 which is embedded in a building wall face and electrically conducts or cuts off a DC supply line Wdc for supplying DC power to a DC equipment 102 by operating an outside operating part in the building face, a second switching element SW2 which is connected in parallel with the first switching element SW1 in the DC supply line Wdc and electrically conducts or cuts off the DC supply line Wdc and a resistance element R1 to be connected to the second switching element SW2 in series, and a time-difference cut-off means which, when cutting off the DC supply line Wdc from a conduction state, cuts off by the second switching element SW2 after firstly cutting off by the first switching element SW1.