To provide a valve device with a link mechanism opening or closing valve seats when a valve element is reciprocated against the valve seats.

A main body 22 has multiple valve seats 25, 26 at crossing positions. A valve element 11 is connected to a connect link 7 constituting the stationary node C of a four-node link mechanism 1. The stationary node C of the four-node link mechanism 1 is provided on a supporter, and the supporter is fixed to the main body 22. A driving link 5 constituting the driver B of the four-node link mechanism 1 is rotated by a rotating 1 means. The valve element 11 is reciprocated toward the valve seats 25, 26 by the rotation of the driving link 5, and the valve seats 25, 26 are opened or closed.