The present invention relates to a portable device and a method for measuring skin hydration using the same. A portable device according to various embodiments of the present invention comprises: a housing; a light emitting unit, located on at least one side of the housing, for irradiating light; a spectroscope for spectroscopically splitting the light into at least one wavelength band; a light receiving unit, located on the at least one side of the housing, for receiving at least a part of the light; and a processor which is electrically connected to at least one of the light emitting unit, the spectroscope, and the light receiving unit, wherein the processor can control the light emitting unit to irradiate light on an object, control the spectroscope to spectroscopically split the light, control the light receiving unit to acquire a spectrum of a first wavelength band on the basis of light which is scattered back from the light irradiated on the object, and determine first hydration of the object on the basis of the acquired spectrum of the first wavelength band.