An ultrasonic testing method comprising steps of: placing a plurality of array sensors on a test object, the array sensors each having multiple ultrasonic elements; and connecting the plurality of array sensors to a phased array ultrasonic testing device such that multiple ultrasonic elements each of which is selected as one from each of the plurality of array sensors are set as one group, and the multiple ultrasonic elements belonging to a same group are selectively connected to a common connector of the phased array ultrasonic testing device via a switcher; characterized by comprising steps of: inputting at one time to the phased array ultrasonic testing device a collection of ultrasonic testing conditions including a plurality of ultrasonic testing conditions each of which is set for one of the plurality of array sensors, the ultrasonic testing conditions including delay time information and identification information of the connectors to which pulsers/receivers (22/23) are connected; causing the phased array ultrasonic testing device to perform ultrasonic testing operations sequentially while switching through all of the plurality of array sensors connected to the phased array ultrasonic testing device with the use of the switcher, wherein the ultrasonic testing operations are performed sequentially on the basis of every ultrasonic testing condition included in the collection of ultrasonic testing conditions at each time the switcher switches the array sensors connected to the phased array ultrasonic testing device; and storing ultrasonic testing data in a designated location on the basis of the order of execution of ultrasonic testing conditions included in the collection of ultrasonic testing conditions, wherein from the plurality of pieces of ultrasonic testing data output sequentially from the phased array ultrasonic testing device, the data in which the array sensors used for ultrasonic testing match ultrasonic testing conditions are selected on the basis of the order of execution of the ultrasonic testing conditions and stored, or all of the plurality of pieces of ultrasonic testing data output sequentially from the phased array ultrasonic testing device are stored, and from the plurality of pieces of ultrasonic testing data stored, the data in which the array sensors used for ultrasonic testing match ultrasonic testing conditions are selected on the basis of the order of execution of the ultrasonic testing conditions. placing a plurality of array sensors on a test object, the array sensors each having multiple ultrasonic elements; and connecting the plurality of array sensors to a phased array ultrasonic testing device such that multiple ultrasonic elements each of which is selected as one from each of the plurality of array sensors are set as one group, and the multiple ultrasonic elements belonging to a same group are selectively connected to a common connector of the phased array ultrasonic testing device via a switcher; inputting at one time to the phased array ultrasonic testing device a collection of ultrasonic testing conditions including a plurality of ultrasonic testing conditions each of which is set for one of the plurality of array sensors, the ultrasonic testing conditions including delay time information and identification information of the connectors to which pulsers/receivers (22/23) are connected; causing the phased array ultrasonic testing device to perform ultrasonic testing operations sequentially while switching through all of the plurality of array sensors connected to the phased array ultrasonic testing device with the use of the switcher, wherein the ultrasonic testing operations are performed sequentially on the basis of every ultrasonic testing condition included in the collection of ultrasonic testing conditions at each time the switcher switches the array sensors connected to the phased array ultrasonic testing device; and storing ultrasonic testing data in a designated location on the basis of the order of execution of ultrasonic testing conditions included in the collection of ultrasonic testing conditions, wherein from the plurality of pieces of ultrasonic testing data output sequentially from the phased array ultrasonic testing device, the data in which the array sensors used for ultrasonic testing match ultrasonic testing conditions are selected on the basis of the order of execution of the ultrasonic testing conditions and stored, or all of the plurality of pieces of ultrasonic testing data output sequentially from the phased array ultrasonic testing device are stored, and from the plurality of pieces of ultrasonic testing data stored, the data in which the array sensors used for ultrasonic testing match ultrasonic testing conditions are selected on the basis of the order of execution of the ultrasonic testing conditions.