Laser-type gas analyzer for ships

Provided is a laser-type gas analyzer for ships that has a structure in which optical axis deviation is unlikely to occur, and that accurately analyzes, over a long period of time, the gas concentration of a low-concentration gas to be measured, which is within an exhaust gas, by excluding the influence of exhaust gas in general marine areas by performing analysis only at a designated marina area and not at general marine areas. A laser-type gas analyzer 1 for ships is configured such that: a cylindrical gas cell 20 is disposed on the outer side of a duct 100; an opening 41 of a duct-side gas introduction unit 40 is disposed in the passage of the duct 70 in which a gas to be measured flows; and only when an exhaust gas containing a low-concentration gas to be measured flows as at a designated marine area, a control unit 80 opens an introduction side valve 60 and a leading-out side valve 70 such that the exhaust gas is introduced into the gas cell 20 and is measured. 提供种船舶用激光气体分析仪，其为难以发生光轴偏差的结构，并且在般海域不进行分析，仅在特