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The present invention relates to a method of redifferentiating adult cells into induced pluripotent stem cells using an electromagnetic field. According to the present invention, the method of redifferentiation into induced pluripotent stem cells using an electromagnetic field has excellent efficacy for redifferentiating adult cells into induced pluripotent stem cells, and induced pluripotent stem cells can be readily obtained. Also, the induced pluripotent stem cells prepared by the method have a large amount of redifferentiation factor expression, and when the stem cells are grafted to a mouse, pluripotency is exhibited. Thus, the redifferentiated induced pluripotent stem cells can be usefully applied to the development of a cell therapeutic agent and studies in the regenerative medicine field.