Exhaust gas purification device and ship including exhaust gas purification device

An exhaust gas purification device disposed in an exhaust passage of an engine disposed in an engine room defined in a hull, the exhaust gas purification device being configured to remove at least a nitrogen oxide from an exhaust gas discharged from the engine, the exhaust gas purification device comprising:

• a catalytic part including a selective reducing catalyst for selectively reducing the nitrogen oxide;
• a reducing agent addition device configured to add a reducing agent to the exhaust gas on an upstream side of the catalytic part in a flow direction of the exhaust gas;
• and
• a casing configured to contain the catalytic part,
• wherein at least a part of the casing is disposed inside the engine room,
• wherein the casing is disposed above a marine gear disposed in the engine room, the marine gear being configured to change a rotational speed of a crank shaft of the engine and transmit the rotational speed to a propeller shaft, and
• wherein L2<L1/2 is satisfied, where L1 is a length from one end of the engine close to the marine gear to another end of the engine away from the marine gear, and L2 is a length from the one end to an exhaust port of the engine, in a fore-aft direction of the hull.