An inspection device , comprising: a transmitter configured to transmit a first ultrasonic wave , the first ultrasonic wave including a plurality of burst waves having a first period Tp; a receiver on which the first ultrasonic wave is incident, the receiver being configured to output a signal corresponding to the incident first ultrasonic wave ; a supporter provided between the transmitter and the receiver ; a transmitting circuit causing the transmitter to emit a first ultrasonic wave ; a receiving circuit outputting a signal corresponding to the incident first ultrasonic wave ; and a controller supplying a control signal to the transmitting circuit , controlling the first period Tp and outputting an inspection signal, the supporter being configured to support an inspection object , the first period Tp (s), a distance Dx (m), and a velocity vx (m/s) satisfying 2 Dx / n + 1 ⋅ vx < Tp < 2 Dx / n ⋅ vx , n being 1 or 2, the distance Dx being a shorter distance of a first distance (L1) and a second distance (L2), the first distance (L1) being a distance along a first direction (D1) between the transmitter and the supporter , the first direction (D1) being from the transmitter toward the receiver , the second distance (L2) being a distance along the first direction (D1) between the supporter and the receiver , the velocity vx being a propagation velocity of the first ultrasonic wave in space between the transmitter and the receiver , and wherein: one of the plurality of burst waves has a first duration Tw, and the first period Tp (s), the distance Dx (m), the velocity vx (m/s), and the first duration Tw (s) satisfy Tw < 2 Dx / vx − Tp ⋅ 2 . a transmitter configured to transmit a first ultrasonic wave , the first ultrasonic wave including a plurality of burst waves having a first period Tp; a receiver on which the first ultrasonic wave is incident, the receiver being configured to output a signal corresponding to the incident first ultrasonic wave ; a supporter provided between the transmitter and the receiver ; a transmitting circuit causing the transmitter to emit a first ultrasonic wave ; a receiving circuit outputting a signal corresponding to the incident first ultrasonic wave ; and a controller supplying a control signal to the transmitting circuit , controlling the first period Tp and outputting an inspection signal, the supporter being configured to support an inspection object , the first period Tp (s), a distance Dx (m), and a velocity vx (m/s) satisfying 2 Dx / n + 1 ⋅ vx < Tp < 2 Dx / n ⋅ vx , n being 1 or 2, the distance Dx being a shorter distance of a first distance (L1) and a second distance (L2), the first distance (L1) being a distance along a first direction (D1) between the transmitter and the supporter , the first direction (D1) being from the transmitter toward the receiver , the second distance (L2) being a distance along the first direction (D1) between the supporter and the receiver , the velocity vx being a propagation velocity of the first ultrasonic wave in space between the transmitter and the receiver , one of the plurality of burst waves has a first duration Tw, and the first period Tp (s), the distance Dx (m), the velocity vx (m/s), and the first duration Tw (s) satisfy Tw < 2 Dx / vx − Tp ⋅ 2 . <EOS>