PROBLEM TO BE SOLVED: To provide an ultrasonic probe in which thickness of an adhesion layer for sticking a piezoelectric layer and a reflective layer is significantly thinned, an ultrasonic image diagnostic apparatus, and a method for manufacturing the ultrasonic probe.SOLUTION: A dematching layer 23 that has acoustic impedance higher than acoustic impedance of a piezoelectric layer 24 is stuck to an opposite-side surface of an ultrasonic output surface of the piezoelectric layer 24 by a thermosetting adhesive. A sum of arithmetic average roughnesses (Ra) of respective adhesive surfaces of the piezoelectric layer 24 and the dematching layer 23 that are stuck to each other by the adhesive is defined as 0.4 &mum or less. Viscosity of the adhesive before the thermal curing is set to 600 cps or less under the temperature of 40°C or less.
