Patent ID: 6921921

Claim:
A light emitting module comprising: a housing comprising a mount member and a lens holding member, the mount member having a support surface provided along a predetermined surface intersecting with a predetermined axis, a hole extending in a direction of the predetermined axis, a lead terminal passing through the hole, and a component mounting surface provided along the predetermined surface; a semiconductor light emitting device having a light emitting surface intersecting with the predetermined axis and being mounted on the mount member; a lens held by the lens holding member, the lens having a first surface which reflects part of light from the semiconductor light emitting device and transmits part of the light, and a second surface which outputs the light transmitted by the first surface; and a semiconductor light receiving device having a light receiving surface for receiving the reflected light and being mounted on the mount member, wherein the lens holding member is placed on the support surface of the mount member so as to cover the semiconductor light emitting device and the semiconductor light receiving device, and wherein a distance between the light receiving surface of the semiconductor light receiving device and the component mounting surface is larger than a distance between the light emitting surface of the semiconductor light emitting device and the component mounting surface.