EXHAUST GAS PURIFICATION DEVICE FOR INTERNAL COMBUSTION ENGINE

An exhaust gas purification device, which purifies exhaust gas in first and second exhaust paths (20A, 20B) extending from an internal combustion engine is provided. The device includes a convergence path (22) extending from the area of convergence of the first and second exhaust paths, a first auxiliary NOx catalyst (25A) provided in the first exhaust path, a second auxiliary NOx catalyst (25B) provided in the second exhaust path, a main NOx catalyst (26) provided in the convergence path, a first addition section (30A), which adds an ammonia source in a first addition amount to a section upstream of the first auxiliary NOx catalyst, thereby supplying urea water to the first auxiliary NOx catalyst, and a second addition section (30B), which adds an ammonia source in a second addition amount to a section upstream of the second auxiliary NOx catalyst, thereby supplying urea water to the second auxiliary NOx catalyst.