PROBLEM TO BE SOLVED: To provide a optical gas sensor unit that is manufactured inexpensively, without causing the number of part items and man-hours to increase.;SOLUTION: This optical gas sensor unit 10 has a cylindrical housing 1 with an inner face 1i for reflecting light, a columnar light source part 2 provided with a light source 2s and arranged at one end part of the housing 1, and a columnar photodetection device part 3, provided with a photo detection device 3d and arranged at the other end part of the housing 1, and the the housing 1, the light source part 2 and/or the photo detection device part 3 are jointed via an adhesive 4.;COPYRIGHT: (C)2007,JPO&INPIT
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