An optical mux and demux module includes: a mirror which has a reflective surface, a parallel block holder which has a first principal surface and a second principal surface arranged in parallel, where the mirror is disposed at a first principal surface side, and a plurality of band pass filters each of which has a fixing side principal surface and an incident side principal surface, where the parallel block holder is fixed on the fixing side principal surface; wherein dug portions, being the same in number with the band pass filters, are formed on the second principal surface which the parallel block holder has, and each of the plurality of band pass filters is fixed with the parallel block holder with an adhesive agent which is thrown into a dug portion.
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