To avoid setting a path to a link in a congested state without increasing a control traffic quantity and to avid concentrated setting of a plurality of paths to the same link.

In the path setting device for a communication network, with which communication is performed after path setting without band reservation, this device is provided with a first path setting means 100a for setting a plurality of paths between a node device 100 of a transmitting side edge and a node device 101 of a receiving side edge, an information reporting means for reporting congested state information as be information on the congested state of the link only from a node device on the path set by this first path setting means 100a to the node device 100 of the transmitting side edge, and a second path setting means 100b for selectively setting one optimum path out of a plurality of paths set by the first path setting means 100a based on the congested state information of the information reporting means.