UNINTERRUPTIBLE SWITCHING DEVICE

PROBLEM TO BE SOLVED: To provide an uninterruptible switching device capable of performing uninterruptible switching for each connection even when it is connected to a transmission line in which a connection requesting uninterruptible switching and a connection not requesting uninterruptible switching are mixed.SOLUTION: A node device as an uninterruptible switching device includes a transmission section 34. The transmission section 34 includes a plurality of phase adjustment selection sections 42 and 43 and a distribution section 41. The phase adjustment selection sections 42 and 43 each, when failure occurs in a path of a connection requesting uninterruptible switching, can switch data to be selected in an uninterruptible manner. The distribution section 41 determines whether or not the acquired data is in the connection requesting uninterruptible switching on the basis of contents included in the respective pieces of data, and when determining that the data is in the connection requesting uninterruptible switching, outputs the data to the phase adjustment selection sections 42 and 43 different for each connection.