An insert includes: a puncture needle main body which has an opening at a tip and is formed in a hollow shape and of which at least a tip portion is inserted into a subject； an optical fiber that is provided in a hollow portion of the puncture needle main body along a length direction of the puncture needle main body； and a photoacoustic wave generation unit that is provided at a light emission end of the optical fiber which is disposed on a tip side of the puncture needle main body, absorbs light emitted from the light emission end, and generates photoacoustic waves. A through-hole is formed in a wall portion forming the hollow portion and the photoacoustic wave generation unit is fixed to the through-hole.
