To provide a muffler capable of making air exhaust sound predetermined sound between mufflers being the same products.

This muffler 10 is provided with a vessel 16 communicating with pipes 18, 20 on the upstream side and the downstream side. Hollow metallic spherical joint bodies S1, S2 are arranged in the vessel 16 to divide and form at least a part of spaces r1, r2, r3 having silencing effect and passages p1, p2, p3, q1, q2 communicating with the spaces.