Optical module using wiring lead integrated resin substrate

An optical module for converting optical/electric signals into electric/optical signals by optically connecting an optical element having electric wirings with an optical fiber held by a ferrule and having a tip end portion without jacketing layers that is projecting from the ferrule the optical module comprising:

• an optical element mounting block having an optical element mounting section for mounting the optical element, and an optical fiber guide for guiding the optical fiber to align optical axes of the optical fiber and the optical element, such that the optical fiber is optically connected with the optical element while maintaining a state in which optical axes of the optical fiber and the optical element are aligned;
• and
• a wiring lead integrated resin substrate having a ferrule holding section for holding the ferrule, an optical element mounting block housing section for housing the optical element mounting block, and wiring leads to which the optical element is electrically wired;
• wherein at least a part of the wiring leads are provided by signal lines in a coplanar guide structure entirely formed on the wiring lead integrated resin substrate such that a characteristic impedance does not change when the wiring leads are electrically connected to external wirings;
• and
• the signal lines are entirely formed on a resin substrate projecting from the optical element mounting block housing section of the wiring lead integrated resin substrate such that the signal lines can be electrically connected to the external wirings without being exposed between the optical module and the external wirings.