PURPOSE: To obtain an ultrasonic probe equipped with a large information detecting area by arranging the plural vibrators of the ultrasonic probe on a plane in arrangement (honeycomb-shaped arrangement) like wasp larvae in a honeycomb so that the ultrasonic radiating axis of the vibrator can be made radial.

CONSTITUTION: When vibrators 1 are simply arranged in the shape of the honeycomb on the plane, there is an effect to decrease the number of the vibrators 1 to be used with the decrease of an overlap ratio. However, an effect is not so much for enlarging the information detecting area to an objective area. When the effect to enlarge the information detecting area to the objective area is considered, the effect of radially arranging the ultrasonic radiating axis of the vibrator 1 is larger in comparison with the simple honeycomb-shaped arrangement on the plane.