An insert includes: a puncture needle main body (15a) which has an opening (15b) 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 (14) that is provided in a hollow portion (15c) of the puncture needle main body (15a) along a length direction of the puncture needle main body (15a)； and a photoacoustic wave generation portion (16) that is provided at a light emission end (14a) of the optical fiber (14) which is disposed on a tip side of the puncture needle main body (15a), absorbs light emitted from the light emission end (14a), and generates photoacoustic waves. A through-hole (15e) is formed in a wall portion (15d) forming the hollow portion (15c) and the photoacoustic wave generation portion (16) is fixed to the through-hole (15e).
