A valve device comprising: at least one valve having a switch portion and adapted to be opened and closed by the switch portion being operated; and a control device adapted to control the valve without being supplied with electricity; wherein the control device includes at least one rotatable control cam having an outer periphery with a concave and convex shape, and a driving device adapted to rotate the control cam only in a first rotational direction (D4), out of the first rotational direction (D4) and a second rotational direction (D5) opposite from the first rotational direction (D4), by being supplied with a pressurized medium, the valve is placed such that the switch portion comes in contact with the outer peripheral portion of the control cam , in order that the valve is opened and closed by the control cam being rotated, the driving device includes a movable member adapted to perform reciprocating motion by being supplied with the pressurized medium, a conversion transmission portion adapted to convert the reciprocating motion of the movable member into rotational motion and to transmit the rotational motion to the control cam , characterised in that the conversion transmission portion includes a rack secured to the movable member , a pinion adapted to rotate by engaging with the rack , and a clutch adapted to transmit, to the control cam , only a rotational torque in the first rotational (D4) torque, out of rotational torques of the pinion , wherein the pinion is adapted to rotate in the first rotational direction (D4) when the movable member performs forward motion, and the driving device includes a drag member adapted to apply a drag force to the movable member , when the movable member performs the forward motion. at least one valve having a switch portion and adapted to be opened and closed by the switch portion being operated; and a control device adapted to control the valve without being supplied with electricity; wherein the control device includes at least one rotatable control cam having an outer periphery with a concave and convex shape, and a driving device adapted to rotate the control cam only in a first rotational direction (D4), out of the first rotational direction (D4) and a second rotational direction (D5) opposite from the first rotational direction (D4), by being supplied with a pressurized medium, the valve is placed such that the switch portion comes in contact with the outer peripheral portion of the control cam , in order that the valve is opened and closed by the control cam being rotated, the driving device includes a movable member adapted to perform reciprocating motion by being supplied with the pressurized medium, a conversion transmission portion adapted to convert the reciprocating motion of the movable member into rotational motion and to transmit the rotational motion to the control cam , characterised in that the conversion transmission portion includes a rack secured to the movable member , a pinion adapted to rotate by engaging with the rack , and a clutch adapted to transmit, to the control cam , only a rotational torque in the first rotational (D4) torque, out of rotational torques of the pinion , wherein the pinion is adapted to rotate in the first rotational direction (D4) when the movable member performs forward motion, and the driving device includes a drag member adapted to apply a drag force to the movable member , when the movable member performs the forward motion. <EOS>