A mobile type radiographic apparatus is provided, which can inhibit damage to a detecting device as much as possible. This invention provides a storage holder for storing an FPD, and catches for fixing the FPD to the storage holder so that the FPD stored cannot be taken out of the storage holder. Further, this invention provides a carriage movement controller which, when a carriage is about to be moved while the FPD is not in a locked state, notifies the operator to that effect. Consequently, the operator will become aware of having forgotten to lock the FPD when moving the carriage. This construction assures that the FPD is in a fixed state, whereby the FPD is never damaged during traveling of the carriage.