| abstract |
A speaker diaphragm in which the Young's modulus, internal loss (tan δ), airtightness, and various strengths are well balanced is provided. The speaker diaphragm according to the present invention includes wood pulp and cellulose nanofibers, wherein, in one embodiment, the cellulose nanofibers are unoxidized cellulose nanofibers. The content rate of the cellulose nanofibers is one part by weight to 20 parts by weight with respect to 100 parts by weight of the wood pulp, for example. |