Reflective optical sensor and proximity sensor

A reflective optical sensor (1) is provided with a light-emitting element (11), a light-receiving element (12), and a package (7) covering the light-emitting element and the light-receiving element, which are mounted on the same substrate (10) in the same direction. The package surface (71) includes an emergent surface (72) located on the light-emitting side of the light-emitting element and a light-receiving surface (73) located on the light-receiving side of the light-receiving element. The light-receiving surface is parallel to the substrate, and the emergent surface inclines towards the light-receiving surface. 反射型光传感器(1)具备在同一基板(10)上安装于同一方向安装的发光元件(11)、受光元件(12)和覆盖发光元件和受光元件的封装件(7)，封装件表面(71)包括位于发光元件的发光侧的出射面(72)和位于受光元件的受光侧的受光面(73)，受光面与基板平行，出射面向受光面倾斜。