According to one embodiment, a failure analyzing device includes a classifying unit that classifies a failure type in a fail bit map corresponding to each layer, a storage unit that stores a rule to combine failed cells of different layers, and a determining unit that groups a classification result matched with the rule among classification results based on the classifying unit. The rule includes a base point failure, an association failure becoming a combination object of the base point failure, a combination condition defining a relationship between the base point failure and the association failure, and a combination failure name. The determining unit extracts the base point failure from the classification result of one layer, extracts the association failure matched with the combination condition from the classification results of the other layers, groups the extracted base point failure and association failure, and provides the combination failure name.