An ultrasound probe comprising: an electroacoustic conversion unit formed by arranging a plurality of piezoelectric devices (2;8;11;14) and a plurality of acoustic matching layers (3;9;12;15) in a predetermined direction, each of the plurality of piezoelectric devices being an electroacoustic conversion device, the plurality of acoustic matching layers being respectively stacked on the plurality of piezoelectric devices; and a first signal flexible board and a second signal flexible board for transferring electric signals to be transmitted to and received from the plurality of piezoelectric devices, wherein the plurality of piezoelectric devices (2;8;11 14), the plurality of acoustic matching layers (3;9;12;15) and the first signal flexible board are stacked in this order and bonded together using an adhesive, wherein an incision (7;10;13;16) is provided in parallel to the arrangement direction, the incision passing through the plurality of piezoelectric devices in respective thickness directions of the piezoelectric devices and extending into the corresponding acoustic matching layers stacked on the respective piezoelectric devices to near a surface of the acoustic matching layers without reaching the surface, the surface not being in contact with the plurality of piezoelectric devices, wherein the incision (7;10;13;16) is provided in plurality at regular intervals in a direction perpendicular to the arrangement direction, and wherein the second signal flexible board is bonded to the plurality of piezoelectric devices (2; 8; 11; 14) by an adhesive with which the plurality of the incisions (7;10;13;16) is filled. an electroacoustic conversion unit formed by arranging a plurality of piezoelectric devices (2;8;11;14) and a plurality of acoustic matching layers (3;9;12;15) in a predetermined direction, each of the plurality of piezoelectric devices being an electroacoustic conversion device, the plurality of acoustic matching layers being respectively stacked on the plurality of piezoelectric devices; and a first signal flexible board and a second signal flexible board for transferring electric signals to be transmitted to and received from the plurality of piezoelectric devices, wherein the plurality of piezoelectric devices (2;8;11 14), the plurality of acoustic matching layers (3;9;12;15) and the first signal flexible board are stacked in this order and bonded together using an adhesive, wherein an incision (7;10;13;16) is provided in parallel to the arrangement direction, the incision passing through the plurality of piezoelectric devices in respective thickness directions of the piezoelectric devices and extending into the corresponding acoustic matching layers stacked on the respective piezoelectric devices to near a surface of the acoustic matching layers without reaching the surface, the surface not being in contact with the plurality of piezoelectric devices, wherein the incision (7;10;13;16) is provided in plurality at regular intervals in a direction perpendicular to the arrangement direction, and wherein the second signal flexible board is bonded to the plurality of piezoelectric devices (2; 8; 11; 14) by an adhesive with which the plurality of the incisions (7;10;13;16) is filled.