| 摘要 |
The formation of the retaining member 42 at the forming of the main board 40 so as to be able to be cut off and the cutting-off from the main board 40 after the board forming of the main board 40 causes the retaining member 42 to be separated in a letterpress shape from the main board 40. In addition, on the main board 40, the earphone plug socket 44 is mounted with the plug-in inlet 44 b facing the outer periphery, the slit is formed and the projected part 43 a of the retaining member 42 is fitted into the slit as well. Further, the fitting of the retaining member 42 into the slit 46 causes the side edge 43 b thereof to abut on a groove 44 a at the back surface of the earphone plug socket 44.
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