A steam turbine valve device comprising: a valve casing in which an inlet flow passage into which a fluid flows, an intermediate flow passage that is configured to communicate with the inlet flow passage and cause the fluid to circulate in a direction that intersects the inlet flow passage, and an outlet flow passage that is configured to communicate with the intermediate flow passage and cause the fluid to circulate in a direction that intersects the intermediate flow passage are formed; an outlet valve seat part provided on the outlet flow passage; an outlet valve body configured to come into contact with the outlet valve seat part and to close the outlet flow passage; an outlet rod part configured to extend along a first central axis and to have an end of a first side in a direction of the first central axis coupled to the outlet valve body; an interlocking shaft part configured to linearly move the outlet rod part in the direction of the first central axis; an intermediate valve seat part provided on the intermediate flow passage; an intermediate valve body configured to come into contact with the intermediate valve seat part and to close the intermediate flow passage; an intermediate rod part configured to extend along a second central axis that intersects the first central axis and to have an end of a first side in a direction of the second central axis coupled to the intermediate valve body; and an intermediate actuator part configured to linearly move the intermediate rod part in the direction of the second central axis, wherein the intermediate actuator part has: a driving part that is configured to advance and retract a linear motion member in a direction perpendicular to the direction of the second central axis; and a link part that is configured to connect the intermediate rod part and the linear motion member, convert displacement of the linear motion member from the direction perpendicular to the direction of the second central axis to the direction of the second central axis, transmit the converted displacement to the intermediate rod part, and move the intermediate rod part in the direction of the second central axis. a valve casing in which an inlet flow passage into which a fluid flows, an intermediate flow passage that is configured to communicate with the inlet flow passage and cause the fluid to circulate in a direction that intersects the inlet flow passage, and an outlet flow passage that is configured to communicate with the intermediate flow passage and cause the fluid to circulate in a direction that intersects the intermediate flow passage are formed; an outlet valve seat part provided on the outlet flow passage; an outlet valve body configured to come into contact with the outlet valve seat part and to close the outlet flow passage; an outlet rod part configured to extend along a first central axis and to have an end of a first side in a direction of the first central axis coupled to the outlet valve body; an interlocking shaft part configured to linearly move the outlet rod part in the direction of the first central axis; an intermediate valve seat part provided on the intermediate flow passage; an intermediate valve body configured to come into contact with the intermediate valve seat part and to close the intermediate flow passage; an intermediate rod part configured to extend along a second central axis that intersects the first central axis and to have an end of a first side in a direction of the second central axis coupled to the intermediate valve body; and an intermediate actuator part configured to linearly move the intermediate rod part in the direction of the second central axis, wherein the intermediate actuator part has: a driving part that is configured to advance and retract a linear motion member in a direction perpendicular to the direction of the second central axis; and a link part that is configured to connect the intermediate rod part and the linear motion member, convert displacement of the linear motion member from the direction perpendicular to the direction of the second central axis to the direction of the second central axis, transmit the converted displacement to the intermediate rod part, and move the intermediate rod part in the direction of the second central axis. a driving part that is configured to advance and retract a linear motion member in a direction perpendicular to the direction of the second central axis; and a link part that is configured to connect the intermediate rod part and the linear motion member, convert displacement of the linear motion member from the direction perpendicular to the direction of the second central axis to the direction of the second central axis, transmit the converted displacement to the intermediate rod part, and move the intermediate rod part in the direction of the second central axis.