Power distribution device

A power distribution device comprising:

• a switch configured to control conduction and interception of a supplied power between a power supply and an electrical load;
• a control unit configured to turn on and off the switch according to a control signal having a voltage lower than the supplied power;
• a power line through which the supplied power flows;
• a signal line through which the control signals flows;
• a resin part covering a portion of the power line and a portion of the signal line, and in which the switch is disposed adjacent to one surface;
• and
• a cooling part disposed adjacent to a back surface of the resin part, the back surface being on a back side of the one surface of the resin part, wherein
• each of the power line and the signal line includes, inside the resin part, a laid-out portion extending in a planar direction orthogonal to an arrangement direction in which the one surface and the back surface are arranged, and a led-out portion extending from the laid-out portion toward the one surface, and
• the laid-out portion of the power line and the laid-out portion of the signal line are located in a projection area of the cooling unit projected in the arrangement direction, and are separated from each other and arranged in the arrangement direction.