A delay measurement device measures a delay time of an end-to-end route path of a virtual private network related to a predetermined user. The delay measurement device includes a measurement route generation unit configured to generate a first route that transfers to a start point node of a route path, transfers back on the route path, and then returns to itself, and to generate a second route of a route that transfers to the start point node of the route path and returns to itself; a packet transmission/reception unit configured to transmit and receive packets circulating on the first route; a delay measurement unit configured to measure a time from transmission of the packet to reception of the packet to set the measured time as a delay time of the route; and a one-way delay calculation unit configured to calculate a one-way delay time of the route path.