A probe provided with a transceiving surface longer in a length direction than in a width direction thereof, and an array of ultrasonic elements provided on the transceiving surface, the probe being for emitting ultrasonic waves to a surface to be inspected of an object to be inspected that faces the transceiving surface, while moving in the width direction, the ultrasonic elements being shaped so as to have the same length in the length direction and in the width direction, and the certain of ultrasonic elements being aligned in the length direction and in the width direction and emitting ultrasonic waves a large number of times throughout the length direction in predetermined emission units of one or more ultrasonic elements.