An ultrasonic device unit includes an ultrasonic device having a device-side terminal, a reinforcing plate having a support surface adapted to support the ultrasonic device, and a flexible printed wiring board to be connected to the ultrasonic device, the flexible printed wiring board includes a connection to be connected to the device-side terminal, a bend continuous with the connection, and extending away from the ultrasonic device, and an outer edge disposed in an end in the extending direction of the bend, and the reinforcing plate is provided with a first side parallel to a first direction crossing the extending direction, and opposed to the bend, and a projection on a reverse surface opposite the support surface, and with which the outer edge has contact when the flexible printed wiring board is curved along the first side in the bend.
