Transformer and electric power supply device comprising transformer

The utility model provides a transformer and an electric power supply device comprising the transformer. The transformer comprises a magnetic core, a first coil unit and a second coil unit, wherein the first coil unit is arranged in the magnetic core and comprises a laminated board, the laminated board is provided with conducting patterns and layers laminated in the laminated board, corresponding conducting patterns in the conducting patterns are arranged on the laminated layers, and the second coil unit comprises a conducting wire with a section of insulation distance from the conducting patterns of the laminated board. The conducting wire comprises a triple insulation wire surrounded by three layers of insulation paper for maintaining the insulation distance from the conducting patterns. The transformer and the electric power supply device have the advantages that the sufficient creepage distance is ensured between the first coil unit and the second coil unit; in addition, the complicated manufacturing process, such as a line shaft structure, is eliminated, so the dimension and the manufacturing cost of the transformer can be reduced.