| 摘要 |
A light-emitting module outputting laser beam emitted from a semiconductor light-emitting element via a lens, the light-emitting module includes a first main plane, a mount portion on the first main plane that mounts the semiconductor light-emitting element, a lens holding portion that holds the lens so that a light axis of the lens corresponds to a reference line crossed at right angles to the first main plane, a semiconductor light-receiving element that receives the laser beam reflected by the lens out of the laser beam emitted from the semiconductor light-emitting element. The semiconductor light-receiving element is positioned on the light axis of the lens and the semiconductor light-emitting element is provided away from the light axis of the lens.
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