Power supply device

A power supply device, comprising:

• a transformer including a primary coil and secondary coil and cores;
• a primary semiconductor component forming a primary circuit connected to the primary-coil side of the transformer;
• a secondary semiconductor component forming a secondary circuit connected to the secondary-coil side of the transformer;
• a choke coil forming the secondary circuit cooperatively with the secondary semiconductor component, the choke coil including a coil portion and cores;
• and
• a circuit board on which a control circuit is formed,
• wherein, the transformer, the primary semiconductor component, the secondary semiconductor component, and the choke coil are electronic components, the electronic components are disposed in pairs, two by two, to form a first stacked body and a second stacked body,
• one pair of the electronic components forming the first stacked body and another pair of the electronic components forming the second stacked body are stacked in a normal direction of the board, and the circuit board is intervened between the one pair of the electronic components forming the first stacked body and the other pair of the electrical components forming the second stacked body.