Provided are a photoelectric conversion connector which enables a high-speed signal transmission between an imaging element with a large number of pixels and a signal processing device and whose size can be reduced, and an optical transmission module. The photoelectric conversion connector is provided with an aligning and connecting part 43 that allows connecting, to a substrate 34, an optical element 32 and an optical fiber 38 that inputs or outputs an optical signal, the aligning and connecting part 43 is provided on a surface different from a surface on which the optical element 32 is mounted of the substrate, the optical fiber 38 is connected to the substrate 34 via the aligning and connecting part 43, and the optical element 32 and the optical fiber 38 are mounted and arranged in line along a direction of a thickness of the substrate 34.
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