A steam valve includes a valve casing, a first valve body having a first cylindrical part and a first end wall part, a second valve body having a second cylindrical part and a second end wall part, a first valve stem capable of vertically biasing the first valve body, a second valve stem capable of vertically biasing the second valve body, a flow guide disposed inside the first cylindrical part and having a projection configured to project downwardly from the first cylindrical part and the second cylindrical part when the first cylindrical part and the second cylindrical part are apart from the valve seat, and a support supporting the flow guide. The support extends from the valve casing or the second valve body to the flow guide through a through hole formed in the first valve body to support the flow guide such that the flow guide is tiltable.