A light reception/emission element module , comprising: a substrate ; a light emitting element disposed on the substrate ; a first light receiving element disposed on the substrate apart from the light emitting element ; a second light receiving element disposed on the substrate ; a side wall disposed on the substrate and surrounding the light emitting element , the first light receiving element and the second light receiving element ; and an upper wall connected to the side wall located above the substrate so as to cover a region surrounded by the side wall , the light emitting element and the second light receiving element being aligned along a first direction (D1), the first light receiving element being disposed in a region between the light emitting element and the second light receiving element , the upper wall comprising a facing surface facing the light emitting element and the first light receiving element , a first light passing portion located above the light emitting element , a second light passing portion located above the second light receiving element , and an intermediate portion located in a region between the first light passing portion and the second light passing portion , wherein a lower surface of the intermediate portion comprises a first inclined surface which is the facing surface inclined toward the light emitting element and a second inclined surface inclined toward the second light receiving element , an upper surface of the upper wall comprises a third inclined surface approaching a lower surface of the upper wall from the side wall toward the first light passing portion and a first light shielding portion which is located on an imaginary line connecting the third inclined surface and a light receiving region of the first light receiving element . a substrate ; a light emitting element disposed on the substrate ; a first light receiving element disposed on the substrate apart from the light emitting element ; a second light receiving element disposed on the substrate ; a side wall disposed on the substrate and surrounding the light emitting element , the first light receiving element and the second light receiving element ; and an upper wall connected to the side wall located above the substrate so as to cover a region surrounded by the side wall , the light emitting element and the second light receiving element being aligned along a first direction (D1), the first light receiving element being disposed in a region between the light emitting element and the second light receiving element , the upper wall comprising a facing surface facing the light emitting element and the first light receiving element , a first light passing portion located above the light emitting element , a second light passing portion located above the second light receiving element , and an intermediate portion located in a region between the first light passing portion and the second light passing portion , wherein a lower surface of the intermediate portion comprises a first inclined surface which is the facing surface inclined toward the light emitting element and a second inclined surface inclined toward the second light receiving element , an upper surface of the upper wall comprises a third inclined surface approaching a lower surface of the upper wall from the side wall toward the first light passing portion and a first light shielding portion which is located on an imaginary line connecting the third inclined surface and a light receiving region of the first light receiving element . <EOS>