A muffler (44; 44a; 44b; 44c) for a saddle type vehicle, containing a catalyst for purification of engine exhaust gas, the muffler (44; 44a; 44b; 44c) comprising: a tube-like main body portion extending in a fore-aft direction of the muffler (44; 44a; 44b; 44c); a first separator (70; 80; 84) and a second separator inside the main body portion so as to divide an interior space of the main body portion into a first expansion chamber, a second expansion chamber (X2; Y2; Z2) and a third expansion chamber (X3; Y3; Z3); and an exhaust pipe (46; 86) extending inside the main body portion from the front toward the rear of the muffler (44; 44a; 44b; 44c), penetrating the first separator (70; 80; 84) and the second separator; wherein the first separator (70; 80; 84) is located at a position further forward than the second separator, the first expansion chamber is on a rearward side of the second separator, the first separator (70; 80; 84) divides a space on a forward side of the second separator inside the main body portion, into the second expansion chamber (X2; Y2; Z2) and the third expansion chamber (X3; Y3; Z3), the catalyst is in the exhaust pipe (46; 86), inside the main body portion, located at a position further forward than the first separator (70; 80; 84), the first separator (70; 80; 84) has a through-hole passed by the exhaust pipe (46; 86), the muffler being characterised in that, the exhaust pipe (46; 86) passes through the through-hole without making contact with the first separator (70; 80; 84) and is supported by the second separator, and the exhaust gas flows through the exhaust pipe (46; 86), the first expansion chamber, the second expansion chamber (X2; Y2; Z2) and the third expansion chamber (X3; Y3; Z3) in this order and then is discharged to an outside of the main body portion. a tube-like main body portion extending in a fore-aft direction of the muffler (44; 44a; 44b; 44c); a first separator (70; 80; 84) and a second separator inside the main body portion so as to divide an interior space of the main body portion into a first expansion chamber, a second expansion chamber (X2; Y2; Z2) and a third expansion chamber (X3; Y3; Z3); and an exhaust pipe (46; 86) extending inside the main body portion from the front toward the rear of the muffler (44; 44a; 44b; 44c), penetrating the first separator (70; 80; 84) and the second separator; wherein the first separator (70; 80; 84) is located at a position further forward than the second separator, the first expansion chamber is on a rearward side of the second separator, the first separator (70; 80; 84) divides a space on a forward side of the second separator inside the main body portion, into the second expansion chamber (X2; Y2; Z2) and the third expansion chamber (X3; Y3; Z3), the catalyst is in the exhaust pipe (46; 86), inside the main body portion, located at a position further forward than the first separator (70; 80; 84), the first separator (70; 80; 84) has a through-hole passed by the exhaust pipe (46; 86), the muffler being characterised in that, the exhaust pipe (46; 86) passes through the through-hole without making contact with the first separator (70; 80; 84) and is supported by the second separator, and the exhaust gas flows through the exhaust pipe (46; 86), the first expansion chamber, the second expansion chamber (X2; Y2; Z2) and the third expansion chamber (X3; Y3; Z3) in this order and then is discharged to an outside of the main body portion.