To provide an exhaust valve capable of preventing clogging of a through-hole or leakage of water from a valve seat.
A valve chamber 3 having an inlet 4 opened at a lower part and an outlet 5 opened at an upper part is formed of a casing comprising a body 1 and a lid 2. A valve seat 6 is formed between the valve chamber 3 and the outlet 5. The body 1 integrally includes a plurality of ribs 9 protruding inside at an inner wall of the valve chamber 3, and a float receiver 10 having a substantially bottomed cylinder shape and having a through-hole 11 with a small opening area at a bottom part is fixed to the inner side of the ribs 9. A screen 15 is attached to the outer periphery of the through-hole 11. A screen 7 is attached to an upper end of the float receiver 10. A spherical float 12 in a free state is arranged in the float receiver 10. Foreign matter is filtered out from a fluid passing through the through-hole 11 by the screen 15, and foreign matter is filtered out from the fluid toward the valve seat 6 by the screen 7.