A power supply control device, comprising: a set of power reception conductors for receiving power from an external power source, wherein each of the set of power reception conductors includes a power reception terminal for receiving power; a set of power supply conductors for supplying power to a charging circuit for charging a battery of an automobile, wherein each of the set of power supply conductors includes a power supply terminal for supplying power; a set of intermediate conductors electrically connected to the set of power reception conductors, respectively; a set of relays configured to make and break electrical connections between the set of intermediate conductors and the set of power supply conductors, respectively; a zero-phase current transformer positioned to allow the set of intermediate conductors to pass through an inside of the zero-phase current transformer; a control circuit configured to, upon detecting an electrical leakage by the zero-phase current transformer, control the set of relays to break the electrical connections between the set of intermediate conductors and the set of power supply conductors; and a body block holding the set of power reception conductors, the set of power supply conductors, and the set of intermediate conductors, wherein: the body block includes a first block and a second block fixed to the first block; the set of power reception conductors and the set of power supply conductors are fixed to the first block, wherein each of the set of power reception conductors includes a first connection terminal and is embedded in the first block such that the power reception terminal and the first connection terminal are exposed, and wherein each of the set of power supply conductors includes a second connection terminal and is embedded in the first block such that the power supply terminal and the second connection terminal are exposed; and the set of intermediate conductors is fixed to the second block, wherein the set of intermediate conductors are electrically connected to the first connection terminals of the set of power reception conductors, respectively, and wherein the set of relays are interposed between the set of intermediate conductors and the second connection terminals of the set of power supply conductors, respectively. a set of power reception conductors for receiving power from an external power source, wherein each of the set of power reception conductors includes a power reception terminal for receiving power; a set of power supply conductors for supplying power to a charging circuit for charging a battery of an automobile, wherein each of the set of power supply conductors includes a power supply terminal for supplying power; a set of intermediate conductors electrically connected to the set of power reception conductors, respectively; a set of relays configured to make and break electrical connections between the set of intermediate conductors and the set of power supply conductors, respectively; a zero-phase current transformer positioned to allow the set of intermediate conductors to pass through an inside of the zero-phase current transformer; a control circuit configured to, upon detecting an electrical leakage by the zero-phase current transformer, control the set of relays to break the electrical connections between the set of intermediate conductors and the set of power supply conductors; and a body block holding the set of power reception conductors, the set of power supply conductors, and the set of intermediate conductors, wherein: the body block includes a first block and a second block fixed to the first block; the set of power reception conductors and the set of power supply conductors are fixed to the first block, wherein each of the set of power reception conductors includes a first connection terminal and is embedded in the first block such that the power reception terminal and the first connection terminal are exposed, and wherein each of the set of power supply conductors includes a second connection terminal and is embedded in the first block such that the power supply terminal and the second connection terminal are exposed; and the set of intermediate conductors is fixed to the second block, wherein the set of intermediate conductors are electrically connected to the first connection terminals of the set of power reception conductors, respectively, and wherein the set of relays are interposed between the set of intermediate conductors and the second connection terminals of the set of power supply conductors, respectively. the body block includes a first block and a second block fixed to the first block; the set of power reception conductors and the set of power supply conductors are fixed to the first block, wherein each of the set of power reception conductors includes a first connection terminal and is embedded in the first block such that the power reception terminal and the first connection terminal are exposed, and wherein each of the set of power supply conductors includes a second connection terminal and is embedded in the first block such that the power supply terminal and the second connection terminal are exposed; and the set of intermediate conductors is fixed to the second block, wherein the set of intermediate conductors are electrically connected to the first connection terminals of the set of power reception conductors, respectively, and wherein the set of relays are interposed between the set of intermediate conductors and the second connection terminals of the set of power supply conductors, respectively.