A wavelength-multiplexing optical communication module includes: a substrate; a plurality of light sources on the substrate; a plurality of joint materials separately disposed on the substrate at positions respectively corresponding to the plurality of light sources; and a plurality of optical components fixed on the substrate by means of the plurality of joint materials respectively, wherein the substrate includes a plurality of forming portions which respectively form peripheries of the plurality of joint materials into shapes of circles or regular polygons having an even number of vertices.