A Raman sensor (100, 100a, 100b, 100c, 100d, 100e) comprising: a light source assembly having a plurality of light sources (111, 111a, 111b) configured to emit light to a plurality of skin points of skin, each of the plurality of skin points having a predetermined separation distance (SDS, SDS1, SDS2) from a light collection region of the skin from which Raman scattered light is collected, wherein the predetermined separation distance indicates a distance from a skin point, at which light emitted by the light source assembly passes through a skin layer, to a skin point corresponding to a center position of a detector; a light collector configured to collect the Raman scattered light from the light collection region of the skin; and the detector configured to detect the collected Raman scattered light, wherein the light source assembly further comprises a reflection surface for reflecting the light, emitted by the plurality of light sources, toward the plurality of skin points; characterized in that the reflection surface comprises: a first reflection surface for reflecting the light, emitted by the plurality of light sources, in a predetermined direction; and a second reflection surface for reflecting the light, reflected by the first reflection surface, toward the plurality of skin points, wherein the second reflection surface comprises: a third reflection surface for reflecting a first light beam, reflected by the first reflection surface, toward a first skin point having a first predetermined separation distance; and a fourth reflection surface for reflecting a second light beam, reflected by the first reflection surface, toward a second skin point having a second predetermined separation distance, wherein the third reflection surface and the fourth reflection surface are arranged in a concentric circle, and wherein a radius of the third reflection surface and a radius of the fourth reflection surface are different from each other. a light source assembly having a plurality of light sources (111, 111a, 111b) configured to emit light to a plurality of skin points of skin, each of the plurality of skin points having a predetermined separation distance (SDS, SDS1, SDS2) from a light collection region of the skin from which Raman scattered light is collected, wherein the predetermined separation distance indicates a distance from a skin point, at which light emitted by the light source assembly passes through a skin layer, to a skin point corresponding to a center position of a detector; a light collector configured to collect the Raman scattered light from the light collection region of the skin; and the detector configured to detect the collected Raman scattered light, wherein the light source assembly further comprises a reflection surface for reflecting the light, emitted by the plurality of light sources, toward the plurality of skin points; characterized in that the reflection surface comprises: a first reflection surface for reflecting the light, emitted by the plurality of light sources, in a predetermined direction; and a second reflection surface for reflecting the light, reflected by the first reflection surface, toward the plurality of skin points, wherein the second reflection surface comprises: a third reflection surface for reflecting a first light beam, reflected by the first reflection surface, toward a first skin point having a first predetermined separation distance; and a fourth reflection surface for reflecting a second light beam, reflected by the first reflection surface, toward a second skin point having a second predetermined separation distance, wherein the third reflection surface and the fourth reflection surface are arranged in a concentric circle, and wherein a radius of the third reflection surface and a radius of the fourth reflection surface are different from each other. a first reflection surface for reflecting the light, emitted by the plurality of light sources, in a predetermined direction; and a second reflection surface for reflecting the light, reflected by the first reflection surface, toward the plurality of skin points, wherein the second reflection surface comprises: a third reflection surface for reflecting a first light beam, reflected by the first reflection surface, toward a first skin point having a first predetermined separation distance; and a fourth reflection surface for reflecting a second light beam, reflected by the first reflection surface, toward a second skin point having a second predetermined separation distance, wherein the third reflection surface and the fourth reflection surface are arranged in a concentric circle, and wherein a radius of the third reflection surface and a radius of the fourth reflection surface are different from each other. a third reflection surface for reflecting a first light beam, reflected by the first reflection surface, toward a first skin point having a first predetermined separation distance; and a fourth reflection surface for reflecting a second light beam, reflected by the first reflection surface, toward a second skin point having a second predetermined separation distance, wherein the third reflection surface and the fourth reflection surface are arranged in a concentric circle, and wherein a radius of the third reflection surface and a radius of the fourth reflection surface are different from each other.