Transformer And Power Supply Apparatus Including The Same

The invention provides a transformer, and the transformer comprises a power supply device, and according to an embodiment of the invention, the transformer comprises the following componets: a core portion, which includes a pair of ferrite cores which are magnetically coupled to each other; a substrate portion, which includes a plurality of substrates on which a conductive pattern is formed and are disposed between the pair of ferrite cores and stacked; an insulator, which includes a plurality of insulators disposed between the plurality of substrates. The plurality of substrates include a first substrate; a pair of shielding substrates which are disposed on upper and lower portions of the first substrate; and a second substrate, which is disposed opposite to the pair of ferrite cores outside the pair of shielding substrates, wherein a conductive pattern formed on the first substrate and a conductive pattern formed on the pair of shield substrates may be formed in the same shape so as to coincide with each ot