Illumination device and method of implementing illumination device

An illumination device in which after an optical fiber holder holding an optical fiber and a phosphor holder holding a phosphor are relatively positionally adjusted, a bonding material intervening between the optical fiber holder and the phosphor holder is cured to bond the optical fiber holder and the phosphor holder, comprising:

• adjustment guide members configured to intervene between the optical fiber holder and the phosphor holder, relatively positionally adjust the optical fiber holder and the phosphor holder so as to arrange an optical axis of the optical fiber and an optical axis of the phosphor on one line, and configured to prevent the optical fiber holder and the phosphor holder from tilting when the bonding material is cured,
• wherein the adjustment guide members have heights based on an end face of one of the optical fiber holder and the phosphor holder, on which the adjustment guide members are disposed, in an optical axis direction on the one side, and form a gap portion between the optical fiber holder and the phosphor holder by the heights, and
• wherein the gap portion is filled with the bonding material.