The purpose of the present invention is to improve detection of a failure in a particulate filter. This device for detecting a failure in a particulate filter has an obtaining unit for obtaining the amount of particulate matter in exhaust flowing out of the particulate filter, a restoring unit for performing filter restoration by oxidizing and removing particulate matter accumulated in the particulate filter, and a failure determining unit for determining that the particulate filter has failed when the amount of particulate matter in the exhaust as obtained by the obtaining unit does not decrease by at least a standard amount within a predetermined period of time after completion of filter restoration by the restoring unit.