There is provided a method of manufacturing a light source module including: preparing a board including circuit wirings and a lens having an accommodation groove formed in a bottom surface thereof; attaching a buffer film to a bottom surface of the accommodation groove of the lens; mounting and arranging a plurality of light emitting devices on one surface of the board such that the plurality of light emitting devices are electrically connected to the circuit wirings; mounting the lens on the board such that the plurality of light emitting devices are accommodated within the accommodation groove in a state in which the buffer film faces the plurality of light emitting devices; and attaching the lens to the board such that the buffer film is tightly attached to upper surfaces of the plurality of light emitting devices and the bottom surface of the accommodation groove.