An optical receptacle includes first to third optical surfaces. The attenuation part includes a plurality of reflecting surfaces that reflects a part of the light entered from the first optical surface and a plurality of transmission surfaces that transmits another part of the light entered from the first optical surface. The reflecting surfaces and the transmission surfaces are alternately disposed in a first direction along an intersection line of the third optical surface and a plane including first and second optical axes, the first optical axis being an optical axis of light transmitted through the attenuation part, the second optical axis being an optical axis of light reflected by the attenuation part. In the third optical surface, the attenuation part is shorter than an irradiation spot at the third optical surface of the light entered from the first optical surface, in at least one direction.