A phasing adder and an ultrasound probe therewith are disclosed. The phasing adder (220) includes a delay charge transferring unit (221), preferably a CCD, and a delay adding unit (222). The delay charge transferring unit obtains signal charge in an amount obtained without amplifying according to charge generated in each of a plurality of piezoelectric elements (210). Each of the plurality of piezoelectric elements includes a piezoelectric body (211) to generate charge according to sound pressure of input ultrasound. The delay charge transferring unit holds the signal charge for a predetermined amount of time. The delay adding unit executes phasing adding of an amount of the signal charge held for the predetermined amount of time in the delay charge transferring unit. The electric capacitance of the first stage charge holding unit is greater than the electric capacitance of each of the later stage charge holding units.
