An examination system and thrombus removing device and comprising: a catheter comprising: a resinous capillary tube having a hole to pass a wire therethrough; a marker attached to a front-end portion of the capillary tube; an optical fiber having a core and a clad located around the core, the optical fiber being buried in the capillary tube and whose position relative to the marker is fixed, the optical fiber receiving a laser beam; and a resin material interposed between the clad of the optical fiber and the capillary tube; wherein a position, in an optical fiber longitudinal direction, of a front-end face of the optical fiber is coincident with a position, in an optical fiber longitudinal direction, of a front-end face of the marker; and the examination system further comprising: a laser light source which emits the laser beam to be inputted to the optical fiber of the catheter; wherein a center wavelength λ, a pulse width T, and a repetition frequency f of the laser beam are set as follows: 520 nm ≤ λ ≤ 590 nm, 1 μsec ≤ T ≤ 100 μsec, and 1 Hz ≤ f ≤ 10 Hz. a catheter comprising: a resinous capillary tube having a hole to pass a wire therethrough; a marker attached to a front-end portion of the capillary tube; an optical fiber having a core and a clad located around the core, the optical fiber being buried in the capillary tube and whose position relative to the marker is fixed, the optical fiber receiving a laser beam; and a resin material interposed between the clad of the optical fiber and the capillary tube; wherein a position, in an optical fiber longitudinal direction, of a front-end face of the optical fiber is coincident with a position, in an optical fiber longitudinal direction, of a front-end face of the marker; and the examination system further comprising: a laser light source which emits the laser beam to be inputted to the optical fiber of the catheter; wherein a center wavelength λ, a pulse width T, and a repetition frequency f of the laser beam are set as follows: 520 nm ≤ λ ≤ 590 nm, 1 μsec ≤ T ≤ 100 μsec, and 1 Hz ≤ f ≤ 10 Hz. a resinous capillary tube having a hole to pass a wire therethrough; a marker attached to a front-end portion of the capillary tube; an optical fiber having a core and a clad located around the core, the optical fiber being buried in the capillary tube and whose position relative to the marker is fixed, the optical fiber receiving a laser beam; and a resin material interposed between the clad of the optical fiber and the capillary tube; wherein a position, in an optical fiber longitudinal direction, of a front-end face of the optical fiber is coincident with a position, in an optical fiber longitudinal direction, of a front-end face of the marker; and the examination system further comprising: a laser light source which emits the laser beam to be inputted to the optical fiber of the catheter; wherein a center wavelength λ, a pulse width T, and a repetition frequency f of the laser beam are set as follows: 520 nm ≤ λ ≤ 590 nm, 1 μsec ≤ T ≤ 100 μsec, and 1 Hz ≤ f ≤ 10 Hz. a laser light source which emits the laser beam to be inputted to the optical fiber of the catheter; wherein a center wavelength λ, a pulse width T, and a repetition frequency f of the laser beam are set as follows: 520 nm ≤ λ ≤ 590 nm, 1 μsec ≤ T ≤ 100 μsec, and 1 Hz ≤ f ≤ 10 Hz.