Lamp for vehicle

A lamp for a vehicle, the lamp comprising:

• a light source part configured to emit light;
• and
• a light guide part configured to guide the light input from the light source part and output the light,
• wherein the light guide part includes:
• a guide body, to which the light irradiated from the light source part is input;
• an input surface, to which the light provided on one side of the guide body is input;
• a reflective surface configured to reflect the light input to the guide body in a forward direction being an output direction;
• an output surface being a surface of an outer surface of the guide body, except for the input surface and the reflective surface, the output surface configured to output the light;
• and
• a 3-dimensional light forming pattern formed to be recessed in the output surface of the guide body, and
• wherein the 3-dimensional light forming pattern is formed to reflect the light input to the guide body in a different direction from a direction of the light reflected by the reflective surface,
• wherein the output surface includes a forwardly convex curved surface,
• wherein, when directions in which the guide body extends are defined as main extension directions, and a line obtained by extending a center of the guide body along the main extension directions is defined as a central axis, the 3-dimensional light forming pattern includes a plurality of unit optical patterns,
• wherein the unit optical pattern is formed on the output surface to be concave,
• wherein the 3-dimensional light forming pattern includes a plurality of sets of optical patterns repeatedly formed along the main extension directions,
• wherein each of the plurality of sets of the optical patterns includes the plurality of unit optical patterns, which are formed to be spaced apart from each other along a circumferential direction of the output surface,
• wherein each unit optical pattern includes an inclined guide surface configured to reflect light in a direction orthogonal to both the forward direction and the main extension direction, and
• wherein the plurality of unit optical patterns are configured to collectively generate a three-dimensional light emission image with varying light intensity across the convex output surface, thereby creating a depth-perceived lighting effect for visual enhancement.