EXHAUST DEVICE FOR INTERNAL COMBUSTION ENGINE

The invention provides an exhaust device for internal combustion engine. In the exhaust device for internal combustion engine, an exhaust muffler 22 is formed from a plurality of layers comprising anexhaust passage pipe 40 and expansion chambers 45, 46, 47. The exhaust muffler 22 is provided with a front assembly 23, and a rear assembly 30 which is sub-assembled separately from the front assembly23. The front assembly 23 is provided with: a front exhaust passage pipe 41; a front muffler body 24 which is disposed so as to cover the outside of the front exhaust passage pipe 41, and which formsa double pipe with the front exhaust passage pipe 41; and an exhaust valve 50 which is disposed inside the front exhaust passage pipe 41. The rear assembly 30 is provided with: a rear exhaust passagepipe 42; and a rear muffler body 31 which is disposed so as to cover the outside of the rear exhaust passage pipe 42, and which forms a double pipe with the rear exhaust passage pipe 42. Accordingly,an exhaust device for an int