A lamp module includes a light source unit that generates light, an optical unit that forms a predetermined beam pattern by transmitting the light generated by the light source unit therethrough, and a reflection unit that reflects the light generated by the light source unit to be incident upon the optical unit. In particular, the light source unit includes a light source chip, which is spaced apart laterally from an optical axis of the optical unit, and the light source chip is disposed to allow a central line that passes through middle of both sides of a light-emitting surface formed by at least one light source to be tilted with respect to the optical axis of the optical unit by an angle that is different from an angle that a central axis of the reflection unit forms with respect to the optical axis of the optical unit.