An alarm monitoring device monitors, when a failure has occurred in a transmission device or a transmission line, an alarm transmitted from a transmission device that has detected the failure. The alarm monitoring device includes: an alarm database for recording therein information included in the alarm, the information being on a detected time, a generated location, an alarm importance, and an ID of a path having the generated location as a route; and a monitoring control unit configured to register information of a received alarm in the alarm database, extract one alarm from the alarm database for each path ID based on an alarm importance and a detected time, determine the detected time as an alarm generation time, associate a path ID of the extracted alarm with the alarm generation time and the alarm importance, and cause to display the path ID as an alarm-generating path list.