Disclosed is an illuminating device which comprises a light guiding unit comprising a protrusion optical pattern forming a gap with an adjacent layer, at least one light emitting unit passing through the light guiding unit, and a resin layer formed on the light guiding unit and the at least one light emitting unit, so it is possible to obtain an effect that the shapes of light change depending on the viewing angle when viewing the light source by producing various protrusion optical patterns, an effect that the whole thickness can be reduced, and an effect that the degree of design freedom can be enhanced when designing products thanks to an enhanced flexibility.