The present invention provides an oil guide device including a body part, an oil flow path extending from one surface of the body part and coupled to an inner diameter portion of a pinion shaft, a first guide configured to allow oil scattering in an automatic transmission to be introduced into an inner diameter portion of the oil flow path, the first guide being disposed on the other surface of the body part and configured to surround the inner diameter portion of the oil flow path, and a second guide extending from an outer diameter portion of the other surface of the body part and configured to surround the first guide, the second guide being configured to guide the remaining oil, which is not directed toward the first guide, to a desired component.