INTERFERENCE FILTER HOLDER, AND INTERFERENCE FILTER MODULE

PROBLEM TO BE SOLVED: To reduce a diameter of an interference filter holder without increasing a cost, and to adjust an inclined angle of an interference filter.SOLUTION: An interference filter holder is composed of a cylindrical body portion 3 having an optical axis 33 as an axis, and a filter holding portion 2a installed on a side surface of the body portion. The body portion is equipped with a hole 32 penetrating between front and rear end surfaces 31, a plane portion 34 made by cutting a side surface upper side in an area from a fore-and-aft center toward both end surfaces, and a circular hole-shaped holding portion insertion hole 36 opening on the plane portion. The filter holding portion is formed with a collar-shaped head portion 21 on an upper surface of a disk-shaped filter installing portion 122 attached with an interference filter 4 on a lower surface 28. On an upper surface 26 of the head portion, a recessed/projecting structure 27 engaged with a predetermined tool is formed. When an outer peripheral surface of the filter installing portion is fitted in while sliding with an inner surface of the holding portion insertion hole 36, a lower surface of the head portion abuts on the plane portion, and the filter holding portion is rotated while using a vertical direction as an axis 23 by using the tool.