[Problem] To provide a valve body in which a seal part is prevented from being dislodged from a main valve body by the action of a fluid. [Solution] A valve body having: a valve main body (24) capable of being displaced between a closed position and an open position; and a seal member (26) having an annular seal part (36), which fits into an annular groove (30) provided along a conical sealing surface (28) of the valve body, hermetically engages with a valve seat surface (34), and prevents a fluid from flowing, and a linking part (38), which passes through a linking hole (32) penetrating through the valve main body (24) in the diametral direction and links portions of the annular seal part (36) facing each other in the diametral direction.
