Sanitary washing device

A sanitary washing device, comprising:

• a nozzle discharging wash water for a private part wash;
• a heat exchanger using alternating current power to heat the wash water supplied to the nozzle;
• a cold water flow channel supplying the wash water to the heat exchanger from a water supply source;
• a switching element switching a supply state of the alternating current power to the heat exchanger;
• a control board to which a controller is mounted, the controller being operated by direct current power, the controller controlling the switching element;
• a heat transfer plate configured to dissipate heat of the switching element;
• and
• a casing storing the nozzle, the heat exchanger, the cold water flow channel, the switching element, the control board, and the heat transfer plate,
• the switching element being mounted to the control board,
• the cold water flow channel including a cooling part,
• the cooling part water-cooling the heat transfer plate,
• the casing including a substrate storage part configured to store the control board in an upright state,
• the substrate storage part being located at a back part of the casing,
• the switching element being mounted to a lower part of the control board,
• the casing including a water receiving part, at least a portion of the water receiving part being positioned below the heat transfer plate, the water receiving part being configured to receive condensation water generated at the heat transfer plate,
• the heat transfer plate being inclined downward from the switching element toward the water receiving part.