| 摘要 |
A rotation detecting device includes a sensor IC, a holder to which the sensor IC is attached, a case body attached to the holder and accommodating the holder and the sensor IC in an internal space of the case body, and a housing accommodating a portion of the case body and the holder. The holder includes a through-hole, which establishes a connection with the internal space of the case body when the case body is attached to the holder. The through-hole is used for injecting a first resin into the internal space of the case body. The injected first resin surrounds the sensor IC in the internal space of the case body. The housing is made of a second resin, which covers the through-hole when the housing is molded with the second resin.
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