A manufacturing method for an ultrasonic probe including the steps of forming a plurality of unit fixing plates. Laminating each unit fixing plates to one another to form a fixing base and inserting lead wires into grooves formed in the fixing base. Partially cutting away and smoothing both principal surfaces of the fixing base to expose lead wires. Fixing a piezoelectric plate to one principal surface of the fixing base and cutting out between the lead wires in a one dimension direction and a two dimension direction, to divide up said piezoelectric plate and the fixing base into a plurality of piezoelectric elements.