Biopsy needle and photoacoustic measurement apparatus

A biopsy needle, comprising:

• a hollow tubular outer needle;
• an inner needle that is movable in a tube axis direction relative to the outer needle and that is disposed in a hollow tube of the outer needle;
• a sample collection portion that has a recessed shape and that is provided on a circumferential surface of the inner needle;
• an inner hole that is provided on each of a distal end side and a rear end side of the sample collection portion in the inner needle and that extends in the tube axis direction of the inner needle;
• a first light guide member that is disposed in the inner hole and that is disposed from the rear end side of the inner needle to vicinity of the distal end of the inner needle;
• a first light absorber that absorbs light emitted from a distal end of the first light guide member and emits a photoacoustic wave;
• and
• a filler that is filled in the inner hole to fix at least a part of the first light guide member.