An optical module includes: amounting substrate; a support block on which the mounting substrate is mounted; and a stem having a support surface to support the support block, the stem having a pedestal portion with a tip face in a protruding direction and with an upper surface spreading along the protruding direction; a relay board on the upper surface; a connection block fixed to the tip face; and wires connecting the support block and the mounting substrate to the connection block. The connection block has a surface made of a conductor. The connection block has a first bonding surface facing the same direction as the tip face of the pedestal portion and a second bonding surface facing the same direction as the upper surface. The wires include first and second wires having their ends bonded to the first and second bonding surface, respectively.