Optical module having structure for defining fixing position of sleeve

An optical module comprising:

• a sleeve having a first holding portion with an insertion hole being capable of accommodating a ferrule arranged at a distal end of an optical fiber, a second holding portion arranged to oppose said first holding portion and having an insertion hole for accommodating an optical operation element, and a flange arranged on an outer wall of said sleeve between said first and second holding portions and having first and second surfaces opposite to each other;
• a circuit board electrically connected to a terminal extending from said optical operation element, said circuit board holding said optical operation element;
• a housing having a cavity for accommodating said entire sleeve held by said circuit board, and a support portion, projecting from an inner wall of said housing, for fixing said sleeve at a predetermined position in the cavity, said support portion having a first reference surface abutting against said first surface of said flange of said sleeve;
• and
• a sleeve holder, attached to said housing, for fixing said sleeve at the predetermined position in the cavity of said housing together with said housing, said sleeve holder having a first spring piece abutting against said second surface of said flange of said sleeve to urge said first surface of said flange of said sleeve against said first reference surface.