A valve unit which switches an opened state where a first flow path (22a, 22b) is connected to a second flow path (22c, 22d) and a closed state where the connection of the first flow path and the second flow path is blocked, the valve unit comprising: a first member having a first facing surface which faces the second flow path, and a first hole (37a, 37b) provided with one end connected to the first flow path and the other end exposed to the first facing surface; a second member having a second facing surface which faces the first facing surface via a space, and a second hole (37c, 37d) provided with one end connected to the second flow path and the other end facing the first hole and exposed to the second facing surface; a shield plate (25, 58) disposed in the space rotatably along the first and second facing surfaces, having a connection hole (25a, 25b) provided at a distance from a rotation center of the shield plate (25, 58), the connection hole (25a, 25b) connecting the first hole to the second hole during rotating, the shield plate being configured to connect the first hole to the second hole and block the connection thereof; and moving means which rotates the shield plate between the opened state where the connection hole coincides with the first and second holes and the closed state where the connection of the first and second holes is blocked, wherein a plurality of sets of the first and second flow paths (22a, 22b, 22c and 22d) are provided, the first and second members (21, 23) have a plurality of sets of the first and second holes (37a, 37b, 37c and 37d) corresponding to the plurality of the sets of the first and second flow paths (22a, 22b, 22c, 22d), the first and second holes (37a, 37b, 37c and 37d) of each set are located at different distances from the rotation center of the shield plate (25, 58) characterized in that a plurality of connection holes (25a, 25b) in the shield plate (25, 58) are configured to simultaneously connect the plurality of the sets of the first and second holes (37a, 37b, 37c and 37d) to one another. a first member having a first facing surface which faces the second flow path, and a first hole (37a, 37b) provided with one end connected to the first flow path and the other end exposed to the first facing surface; a second member having a second facing surface which faces the first facing surface via a space, and a second hole (37c, 37d) provided with one end connected to the second flow path and the other end facing the first hole and exposed to the second facing surface; a shield plate (25, 58) disposed in the space rotatably along the first and second facing surfaces, having a connection hole (25a, 25b) provided at a distance from a rotation center of the shield plate (25, 58), the connection hole (25a, 25b) connecting the first hole to the second hole during rotating, the shield plate being configured to connect the first hole to the second hole and block the connection thereof; and moving means which rotates the shield plate between the opened state where the connection hole coincides with the first and second holes and the closed state where the connection of the first and second holes is blocked, wherein a plurality of sets of the first and second flow paths (22a, 22b, 22c and 22d) are provided, the first and second members (21, 23) have a plurality of sets of the first and second holes (37a, 37b, 37c and 37d) corresponding to the plurality of the sets of the first and second flow paths (22a, 22b, 22c, 22d), the first and second holes (37a, 37b, 37c and 37d) of each set are located at different distances from the rotation center of the shield plate (25, 58) characterized in that a plurality of connection holes (25a, 25b) in the shield plate (25, 58) are configured to simultaneously connect the plurality of the sets of the first and second holes (37a, 37b, 37c and 37d) to one another.