An ultrasonic unit includes a first and a second ultrasonic wave transmission and reception portions that transmit ultrasonic waves to a subject and receive ultrasonic waves reflected from the subject, a first sound guide portion through which ultrasonic waves transmitted and received by a first ultrasonic wave transmission and reception portion pass, and a second sound guide portion through which ultrasonic waves transmitted and received by a second ultrasonic wave transmission and reception portion pass, in which a distance between the first sound guide portion and the second sound guide portion is gradually reduced toward the subject.
