Optical transceiver

The invention provides an optical transceiver, and aims to suppress leakage of useless electromagnetic waves. The optical transceiver has an attenuation structure (42) provided so as to attenuate electromagnetic waves in an intermediate space (38) through which the optical fiber (20) passes. The inner space (32) is continuous in a first direction between the photoelectric element (16) and the optical connector (10) and is surrounded by the conductive surface in any direction orthogonal to the first direction, the attenuation structure is a column structure comprising a plurality of conductive columns (44) conducting with the conductive surface, in the column structure, the plurality of conductive columns extend in a second direction orthogonal to the first direction, and the plurality of conductive columns extend in the second direction orthogonal to the first direction. The plurality of conductive pillars are arranged at a plurality of points in a plan view along the second direction, the plurality of points